Joel and I were returning to campus after engorging ourselves on tasty pho, and decided to take the back pathway to 36 and drive past all of the construction and get a firsthand view on the construction progress, and once again found ourselves discussing the obvious lack of corporate dialog around the company's (alleged) secret plans to build a vast underground transportation hub to link up the various Puget Sound buildings with the existing (speculation) tube system between campus and Bill's waterfront home. In fact, it is the lack of dialog and, in my opinion, utter absence of content around management's secret plans for a futuristic pod transportation system that make it obvious that pneumatic capsule pipelines are indeed being built underneath the campus. By not saying anything, they reveal everything.
For a brief history of the technology, you can take a look at Wikipedia.
One of the leading minds in the area of Pneumatic Capsule Pipelines (PCP), Mr. Tim Howgego, has spent the past decade working in transport economics and public transport development, and has created a fascinating website that documents the history and science behind this technology. He's also into World of Warcraft, big time.
From his website:
Simple PCPs follow conventional fluid mechanics principles. Air is blown down and / or extracted from the pipeline, propelling the capsule along the pipe. Both ends of the pipeline are sealed during transport, allowing the air behind the capsule to be above atmospheric pressure, and / or air in front of the capsule to be below atmospheric pressure. Simple PCPs involve a limited number of capsules in the system at any one time (normally just one). This reflects the inefficiency of creating sufficient pressures to propel multiple capsules, and the difficulty in retrieving one capsule from the end of the pipeline while a second capsule was being propelled.

Diagram showing Carsten's theory as applied to a simple capsule pipeline system (Source: Based on Carstens).
Modern PCP large diameter systems utilise through flow booster pumps, also known as jet pump injectors. These create the pressure differentials required to propel multiple capsules through a pipeline,
while allowing both terminals at atmospheric pressure. This is done by placing a booster pump midway along the pipeline, and designing it in such a way that capsules can pass through the pump.
Hey, with technical-looking diagrams and references to obscure theories, I'm convinced its all legit.
Of course, for me, the real motivation for seeing this dream come to fruition here on campus in the opportunity to wear an orange-colored muscle suit with a bald cap, which seems to be the required standard outfit for riding in any kind of futuristic device. Sort of like how aliens are always in gray or silver jumpsuits. I'm guessing it reduces chaffing during pod rides.
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