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[QUOTE="Propane Goat, post: 6892086, member: 96298"]
In the late 1990s, the city of Boston drilled a horizontal underground tunnel so that they could discharge treated sewage further out to sea instead of into Boston Harbor. The tunnel is almost 10 miles long and when it was near completion, they removed the ventilation system but didn't spend enough time thinking through how they were going to coordinate the removal of the seawater plugs at the end of the tunnel.

The problem here was that without the ventilation system, bacteria and iron rust would consume all of the oxygen in the tunnel and anyone entering without oxygen tanks would suffocate almost instantly. [URL='https://theworld.org/stories/2015-06-16/clean-its-harbor-boston-paid-toll-human-life']They hired some risk-taker to rig up a set of breathing tanks so that they could run two Humvees into the end of the tunnel and get the plugs ready to release, but the system failed and two people died.[/URL]

My rejected location would be at the far end of that tunnel before it was flooded, but after the ventilation system was removed. Imagine a place in absolute darkness, under the ocean, and filled with a lethal atmosphere. You need a constantly supply of oxygen to survive and if this supply fails, there is no way you will be able to spend 4 hours walking out of the tunnel because you will be dead in a fraction of that time.
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