Alcatraz first operated as a prison in 1859, when the military fort first held convicted soldiers. The prison technology of the time was simple, consisting of little more than a basement room with a trap-door entrance. Only small numbers of prisoners were held in this period, but it established Alcatraz as a center of incarceration. Later, the Civil War triggered construction of a "political prison," a term with fewer negative connotations at the time, for confederate sympathizers. This prison was more purpose-built (although actually a modification of an existing shop), but it was small and not designed for an especially high security level. It presaged, though, a much larger construction project to come. Alcatraz had several properties that made it an attractive prison. First, it had seen heavy military construction as a Civil War defensive facility, but just decades later improvements in artillery made its fortifications obsolete. That left Alcatraz surplus property, a complete military installation available for new use. Second, Alcatraz was formidable. The small island was made up of steep rock walls, and it was miles from shore in a bay known for its strong currents. Escape, even for prisoners who had seized control of the island, would be exceptionally difficult. These advantages were also limitations. Alcatraz was isolated and difficult to support, requiring a substantial roster of military personnel to ferry supplies back and forth. There were no connections to the mainland, requiring on-site power and water plants. Corrosive sea spray, sent over the island by the Bay's strong winds, lay perpetual siege on the island. Buildings needed constant maintenance, rust covered everything. Alcatraz was not just a famous prison, it was a particularly complicated one. In 1909, Alcatraz lost its previous defensive role and pivoted entirely to military prison. The Citadel, a hardened barracks building dating to the original fortifications, was partially demolished. On top of it, a new cellblock was built. This was a purpose-built prison, designed to house several hundred inmates under high security conditions. Unfortunately, few records seem to survive from the construction and operation of the cellblock as a disciplinary barracks. At some point, a manual telephone exchange was installed to provide service between buildings on the island. I only really know that because it was recorded as being removed later on. Communications to and from Alcatraz were a challenge. Radio and even light signals were used to convey messages between the island and other military installations on the bay. There was a constant struggle to maintain cables. Early efforts to lay cables in the bay were less about communications and more about triggering. Starting in 1883, the Army Corps of Engineers began the installation of "torpedoes" in the San Francisco bay. These were different from what we think of as torpedoes today, they were essentially remotely-operated mines. Each device floated in the water by its own buoyancy, anchored to the bottom by a cable that then ran to shore. An electrical signal sent down the cable detonated the torpedo. The system was intended primarily to protect the bay from submarines, a new threat that often required technically complex defenses. Submarines are, of course, difficult to spot. To make the torpedoes effective, the Army had to devise a targeting system. Observation posts on each side of the Golden Gate made sightings of possible submarines and reported them to a control post, where they were plotted on the map. With a threat confirmed, the control post would begin to detonate nearby torpedoes. A second set of observation posts, and a second line of torpedoes, were located further into the bay to address any submarines that made it through the first barrage. By 1891, there were three such control points in total: Fort Mason, Angel Island, and Yerba Buena. The rather florid San Francisco Examiner of the day described the control point at Fort Mason, a "chamber of death and destruction" in a tunnel twenty feet underground. The Army "death-dealers" that manned the plotting table in that bunker had access to a board that "greatly resemble[d] the switch board in the great operating rooms of the telephone companies." By cords and buttons, they could select chains of mines and send the signal to fire. NPS historians found that a torpedo control point had been planned at Alcatraz, and one of the fortifications modified to accommodate it, but never seems to have been used. The 1891 article gives a hint of the reason, noting that the line from Alcatraz to Fort Mason was "favorable for a line of torpedoes" but that currents were so strong that it was difficult to keep them anchored. Perhaps this problem was discovered after construction was already underway. Somewhere around 1887-1888, the Army Signal Corps had joined the cable-laying fray. A telegraph cable was constructed from the Presidio to Alcatraz, and provided good service except for the many times that it was drug up by anchors and severed. This was a tremendous problem: in 1898, Gen. A. W. Greely of the Signal Corps called San Francisco the "worst bay in the country" for cable laying and said that no cable across the Golden Gate had lasted more than three years. The General attributed the problem mainly to the heavy shipping traffic, but I suspect that the notorious currents must have been a factor in just how many anchors were dragged through cables [1]. In 1889, a brand new Army telegraph cable was announced, one that would run from Alcatraz to Angel Island, and then from Angel Island to Marin County. An existing commercial cable crossed the Golden Gate, providing a connection all the way to the Presidio. The many failures of Alcatraz cables makes it difficult to keep track. For example, a cable from Fort Mason to Alcatraz Island was apparently laid in 1891---but a few years later, it was lamented that Alcatraz's only cable connection to Fort Mason was indirect, via the 1889 Angel Island cable. Presumably the 1891 cable was damaged at some point and not replaced, but that event doesn't seem to have made the papers (or at least my search results!). In 1900, a Signal Corps officer on Angel Island made a routine check of the cable to Alcatraz, finding it in good working order---but noticing that a "four masted schooner... in direct line with the cable" seemed to be in trouble just off the island and was being assisted by a tug. That evening, the officer returned to the cable landing box to find the ship gone... along with the cable. A French ship, "Lamoriciere," had drifted from anchor overnight. A Signal Corps sergeant, apparently having spoken with harbor officials, reported that the ship would have run completely aground had the anchor not caught the Alcatraz cable and pulled it taught. Of course the efforts of the tug to free Lamoriciere seems to have freed a little more than intended, and the cable was broken away from its landing. "Its end has been carried into the bay and probably quite a distance from land," the Signal Corps reported. This ongoing struggle, of laying new cables to Alcatraz and then seeing them dragged away a few years later, has dogged the island basically to the modern day---when we have finally just given up. Today, as during many points in its history, Alcatraz must generate its own power and communicate with the mainland via radio. When the Bureau of Prisons took control of Alcatraz in 1933, they installed entirely new radio systems. A marine AM radio was used to reach the Coast Guard, their main point of contact in any emergency. Another radio was used to contact "Alcatraz Landing" from which BOP ferries sailed, and over the years several radios were installed to permit direct communications with military installations and police departments around the Bay Area. At some point, equipment was made available to connect telephone calls to the island. I'm not sure if this was manual patching by BOP or Coast Guard radio operators, or if a contract was made with PT&T to provide telephone service by radio. Such an arrangement seems to have been in place by 1937, when an unexplained distress call from the island made the warden impossible to contact (by the press or Bureau of Prisons) because "all lines [were] tied up." Unfortunately I have not been able to find much on the radiotelephone arrangements. The BOP, no doubt concerned about security, did not follow the Army's habit of announcing new construction projects to the press. Fortunately, the BOP-era history of Alcatraz is much better covered by modern NPS documentation than the Army era (presumably because the more recent closure of the BOP prison meant that much of the original documentation was archived). Unfortunately, the NPS reports are mostly concerned with the history of the structures on the island and do not pay much attention to outside communications or the infrastructure that supported it. Internal arrangements on the island almost completely changed when the BOP took over. The Army had left Alcatraz in a degree of disrepair (discussions about closing it having started by at least 1913), and besides, the BOP intended to provide a much higher level of security than the Army had. Extensive renovations were made of the main cellblock and many supporting buildings from 1933 to about 1939. The 1930s had seen a great deal of innovation in technical security. Technologies like electrostatic and microwave motion sensors were available in early forms. On Alcatraz, though, the island was small and buildings tightly spaced. The prison staff, and in some cases their families, would be housed on the island just a stones throw from the cellblock. That meant there would be quite a few people moving around exterior to the prison, ruling out motion sensors as a means of escape detection. Exterior security would instead be provided by guard and dog patrols. There was still some cutting-edge technical security when Alcatraz opened, including early metal detectors. At first, the BOP contracted the Teletouch Corporation of New York City. Teletouch, a manufactured burglar alarms and other electronic devices, was owned by or at least affiliated with famed electromagnetics inventor and Soviet spy Leon Theremin. Besides the instrument we remember him for today, Theremin had invented a number of devices for security applications, and the metal detectors were probably of his design. In practice, the Teletouch machines proved unsatisfactory. They were later replaced with machines made by Forewarn. I believe the metal detector on display today is one of the Forewarn products, although the NPS documents are a little unclear on this. Sensitive common areas like the mess hall, kitchen, and sallyport wre fitted with electrically-activated teargas canisters. Originally, the mess hall teargas was controlled by a set of toggle switches in a corner gun gallery, while the sallyport teargas was controlled from the armory. While the teargas system was never used, it was probably the most radical of Alcatraz's technical security measures. As more electronic systems were installed, the armory, with its hardened vault entrance and gun issue window, served as a de facto control center for Alcatraz's initial security systems. The Army's small manual telephone switchboard was considered unsuitable for the prison's use. The telephone system provided communication between the guards, making it a critical part of the overall security measures, and the BOP specified that all equipment and cabling needed to be better secured from any access by prisoners. Modifications to the cellblock building's entrance created a new room, just to the side of the sallyport, that housed a 100-line automatic exchange. Automatic Electric telephones that appear throughout historic photos of the prison would suggest that this exchange had been built by AE. Besides providing dial service between prison offices and the many other structures on the island, the exchange was equipped with a conference circuit that included annunciator panels in each of the prison's main offices. Assuming this was the type provided by Automatic Electric, it provided an emergency communications system in which the guard telephones could ring all of the office and guard phones simultaneously, even interrupting calls already in progress. Annunciator panels in the armory and offices showed which phone had started the emergency conference, and which phones had picked up. From the armory, a siren on the building roof could be sounded to alert the entire island to any attempted escape. Some locations, including the armory and the warden's office, were also fitted with fire annunciators. I am less clear on this system. Fire circuits similar to the previously described conference circuit (and sometimes called "crash alarms" after their use on airfields) were an optional feature on telephone exchanges of the time. Crash alarms were usually activated by dedicated "hotline" phones, and mentions of "emergency phones" in various prison locations support that this system worked the same way. Indeed, 1950s and 60s photos show a red phone alongside other telephones in several prison locations. The fire annunciator panels probably would have indicated which of the emergency phones had been lifted to initiate the alarm. One of the most fascinating parts of Alcatraz, to a person like me, is the prison doors. Prison doors have a long history, one that is interrelated with but largely distinct from other forms of physical security. Take a look, for example, at the keys used in prisons. Prisons of the era, and even many today, rely on lever locks manufactured by specialty companies like Folger Adams and Sargent and Greenleaf. These locks are prized for their durability, and that extends to the keys, huge brass plates that could hold up to daily wear well beyond most locks. At Alcatraz, the first warden adopted a "sterile area" model in which areas accessible to prisoners should be kept as clear as possible of dangerous items like guns and keys. Guards on the cellblock carried no keys, and cell doors lacked traditional locks. Instead, the cell doors were operated by a central mechanical system designed by Stewart Iron Works. To let prisoners out of cells in the morning, a guard in the elevated gun gallery passed keys to a cellblock guard in a bucket or on a string. The guard unlocked the cabinet of a cell row's control system, revealing a set of large levers. The design is quite ingenious: by purely mechanical means, the guard could select individual cells or the entire row to be unlocked, and then by throwing the largest lever the guard could pull the cell doors open---after returning the necessary key to the gun gallery above. This 1934 system represents a major innovation in centralized access control, designed specifically for Alcatraz. Stewart Iron Works is still in business, although not building prison doors. Some years ago, the company assisted NPS's work to restore the locking system to its original function. The present-day CEO provided replicas of the original Stewart logo plate for the restored locking cabinets. Interviewing him about the restoration work, the San Francisco Chronicle wrote that "Alcatraz, he believes, is part of the American experience." The Stewart mechanical system seems to have remained in use on the B and C blocks until the prison closed, but the D block was either originally fitted, or later upgraded, with electrically locked cell doors. These were controlled from a set of switches in the gun gallery. In 1960, the BOP launched another wave of renovations on Alcatraz, mostly to modernize its access and security arrangements to modern standards. The telephone exchange was moved away from the sallyport to an upper floor of the administration building, freeing up its original space for a new control center. This is the modern sallyport control area that visitors look into through the ballistic windows; the old service windows and viewports into the armory anteroom that had been the de facto control center are now removed. This control center is more typical of what you will see in modern prisons. Through large windows, guards observed the sallyport and visitor areas and controlled the electrically operated main gates. An electrical interlock prevented opening the full path from the cellblock to the outside, creating a mantrap in the visitor area through which the guards in the control room could identify everyone entering and leaving. Photos from the 1960 control room, and other parts of the prison around the same time, clearly show consoles for a Western Electric 507B PBX. The 507B is really a manual exchange, although it used keys rather than the more traditional plugboard for a more modern look. It dates back to about 1929---so I assume the 507B had been installed well before the 1960 renovation, and its appearance then is just a bias of more and better photos available from the prison's later days. Fortunately, the NPS Historic Furnishings Report for the cellblock building includes a complete copy of a 1960s memo describing the layout and requirements for the control center. We're fortunate to get such a detailed listing of the equipment: Four phones (these are Automatic Electric instruments, based on the photo). One is a fire reporting phone (presumably on the exchange's "crash alarm" circuit), one is the watch call reporting phone (detailed in a moment), a regular outgoing call telephone, and an "executive right of way" phone that I assume will disconnect other calls from the outgoing trunks. The 507B PBX switchboard An intercom for communication with each of the guard towers Controls for five electrically operated doors Intercoms to each of the electrically operated doors (many of these are right outside of the control center, but the glass is very thick and you would not otherwise be able to converse) An "annunciator panel for the interior telephone system" which presumably combines the conference circuit, fire circuit, and watch call annunciators. An intercom to the visitor registration area A "paging intercom for group control purposes." I don't really know what that is, possibly it is for the public address speakers installed in many parts of the cellblock. Monitor speaker for the inmate radio system. This presumably allowed the control center to check the operation of the two-channel wired radio system installed in the cells. The "watch call answering device," discussed later. An indicator panel that shows any open doors in the D cell block (which is the higher security unit and the only one equipped with electrically locking cell doors). Two-way radio remote console Tear gas controls Many of these are things we are already familiar with, but the watch call telephone system deserves some more discussion. It was clearly present back in the 1930s, but it wasn't clear to me what it actually did. Fortunately this memo gives some details on the operation. Guards calling in to report their watch call extension 3331. This connects to the watch call answering device in the control center, which when enabled, automatically answers the call during the first ring. The answering device then allows a guard anywhere in the control center to converse with the caller via a loudspeaker and microphone. So, the watch call system is essentially just a speaker phone. This approach is probably a holdover from the 1930s system (older documents mention a watch call phone as well), and that would have been the early days for speakerphones, making it a somewhat specialized device. Clearly it made these routine watch calls a lot more convenient for the control center, especially since the guard there didn't even have to do anything to answer. It might be useful to mention why this kind of system was used: I have never found any mention of two-way radios used on Alcatraz, and that's not surprising. Portable two-way radios were a nascent technology even in the 1960s---the handheld radio had basically been invented for the Second World War, and it took years for them to come down in size and price. If Alcatraz ever did issue radios to guards, it probably would have been in the last decade of operation. Instead, telephones were provided at enough places in the facility that guards could report their watch tour and any important events by finding a phone and calling the control center. Guards were probably required to report their location at various points as they patrolled, so the control center would receive quite a few calls that were just a guard saying where they were---to be written down in a log by a control room guard, who no doubt appreciated not having to walk to a phone to hear these reports. This provided both the functions of a "guard tour" system, ensuring that guards were actually performing their rounds, and improved the safety of guards by making it likely that the control center would notice fairly promptly that they had stopped reporting in. Alcatraz closed as a BOP prison in 1963, and after a surprising number of twists and turns ranging from plans to develop a shopping center to occupation by the Indians of All Tribes, Alcatraz opened to tourists. Most technology past this point might not be considered "historic," having been installed by NPS for operational purposes. I can't help but mention, though, that there were more attempts at a cable. For the NPS, operating the power plant at Alcatraz was a significant expense that they would much rather save. The idea of a buried power cable isn't new. I have seen references, although no solid documentation, that the BOP laid a power cable in 1934. They built a new power plant in 1939 and operated it for the rest of the life of the prison, so either that cable failed and was never replaced, or it never existed at all... I should take a moment here to mention that LLM-generated "AI slop" has become a pervasive and unavoidable problem around any "hot SEO topic" like tourism. Unfortunately the history of tourist sites like Alcatraz has become more and more difficult to learn as websites with well-researched history are displaced in search results by SEO spam---articles that often contains confident but unsourced and often incorrect information. This has always been a problem but it has increased by orders of magnitude over the last couple of years, and it seems that the LLM-generated articles are more likely to contain details that are outright made up than the older human-generated kind. It's really depressing. That's basically all I have to say about it. It seems that a power cable was installed to Alcatraz sometime in the 1960s but failed by about 1971. I'm a little skeptical of that because that was the era in which it was surplus GSA property, making such a large investment an odd choice, so maybe the 1980s article with that detail is wrong or confusing power with one of the several telephone cables that seem to have been laid (and failed) during BOP operations). In any case, in late 1980 or early 1981, Paul F. Pugh and Associates of Oakland designed a novel type of underwater power cable for the NPS. It was expected to provide power to Alcatraz at much reduced cost compared to more traditional underwater power cable technologies. It never even made it to day 1: after the cable was laid, but before commissioning, some failure caused a large span of it to float to the surface. The cable was evidently not repairable, and it was pulled back to shore. 'I don't know where we go from here,' William J. Whalen, superintendent of the Golden Gate National Recreation Area, said after the broken cable was hauled in. We do know now: where the NPS went from there was decades of operating two diesel generators on the island, until a 2017 DoE-sponsored project that installed solar panels on the cellblock building roof. The panels were intentionally installed such that they are not visible anywhere from the ground, preserving the historic integrity of the site. In aerial photos, though, they give Alcatraz a curiously modern look. The DoE calls the project, which incorporates battery storage and backup diesel generators, as "one of the largest microgrids in the United States." That is an interesting framing, one that emphasizes the modern valance of "microgrid," since Alcatraz had been a self-sufficient electrical system since the island's first electric lights. But what's old is, apparently, new again. I originally wrote much of this as part of a larger travelogue on my most recent trip to Alcatraz, which was coincidentally the same day as a visit by Pam Bondi and Doug Burgum to "survey" the prison for potential reopening. That piece became long and unwieldy, so I am breaking it up into more focused articles---this one on the technical history, a travelogue about the experience of visiting the island in this political context and its history as a symbol of justice and retribution, and probably a third piece on the way that the NPS interprets the site today. I am pitching the travelogue itself to other publications so it may not have a clear fate for a while, but if it doesn't appear here I'll let you know where. In any case there probably will be a loose part two to look forward to. [1] Greely had a rather illustrious Army career. His term as chief of the Signal Corps was something of a retirement after he led several arctic expeditions, the topic of his numerous popular books and articles. He received the Medal of Honor shortly before his death in 1935.

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Today I learned that Kagi uses Yandex as part of its search infrastructure, making up about 2% of their costs, and their CEO has confirmed that they do not plan to change that. To quote: Yandex represents about 2% of our total costs and is only one of dozens of sources we use. To put this in perspective: removing any single source would degrade search quality for all users while having minimal economic impact on any particular region. The world doesn’t need another politicized search engine. It needs one that works exceptionally well, regardless of the political climate. That’s what we’re building. That is unfortunate, as I found Kagi to be a good product with an interesting take on utilizing LLM models with search that is kind of useful, but I cannot in good heart continue to support it while they unapologetically finance a major company that has ties to the Russian government, the same country that is actively waging a war against Ukraine, an European country, for over 11 years, during which they’ve committed countless war crimes against civilians and military personnel. Kagi has the freedom to decide how they build the best search engine, and I have the freedom to use something else. Please send all your whataboutisms to /dev/null.