alt Hacker NewsAs people spent time in them, the oxygen would run out and be replaced with carbon dioxide, which is heavier than air and would sink to the bottom. With no exits and no airflow, wouldn't this become a straightforward deathtrap at some point? Or were there ways to force clean air to the bottom, somehow forcing out the CO2?
Seems to me that a secure hiding place that only works for up to N hours then becomes a death trap is a really bad concept