When there is a fire, the victims die from asphyxia a long time before they are reached by the fire. Imagine you find yourself on a hotel burning down, you can not escape, and your last refuge is the bathroom. You lock yourself there, but the oxygen is running out.
If you've got a flexible tube or hose, you can survive longer while you wait for the firefighters. Here is how.
Just make sure, you flush properly the toilet before.
Source: Amazings.es
Until you suck in a big gulp of Hydrogen Sulfide gas, Carbon Dioxide, or some other Oxygen-deficient atmosphere. Clever idea, but from my experience with sewer collection systems, I believe that option could be more dangerous.
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