Well that weakens my point substantially, but I still think that 'totally' is too much blame. If you leave your building hooked up to an open tunnel line, some

Well that weakens my point substantially, but I still think that 'totally' is too much blame. If you leave your building hooked up to an open tunnel line, something could come in through it. And that something could be water (or gas, or rodents...). Claiming that's "totally" the city's fault strikes me as a dangerous abdication of personal responsibility.