Nothing conspirational about it at all. This is how people designed cities and buildings to stay warm. Probably there are old city planning books mentioning it. Maybe conspirators made their own to blend in, or occupied abandoned ones, an age-old practice in every city that could have a basement, but tunnels themselves are not inherently evil. Also, most of these service "tunnels" are at a basement or subbasement depth, they aren't out of the way at all. Because they are there for service. Much like sewers, they aren't the vast expanse that they are in video games. Some are hardliy standing room, not too comfy for nefarious activity. The most ominous things about them would be a pipe bursting and spewing steam all over, plus of course the asbestos wrapping an inch thick around them.
Nothing conspirational about it at all. This is how people designed cities and buildings to stay warm. Probably there are old city planning books mentioning it. Maybe conspirators made their own to blend in, or occupied abandoned ones, an age-old practice in every city that could have a basement, but tunnels themselves are not inherently evil. Also, most of these service "tunnels" are at a basement or subbasement depth, they aren't out of the way at all. Because they are there for service. Much like sewers, they aren't the vast expanse that they are in video games. Some are hardliy standing room, not too comfy for nefarious activity. The most ominous things about them would be a pipe bursting and spewing steam all over, plus of course the asbestos wrapping an inch thick around them.