Originally posted by Retrovirus
1. The egg.
2. The can. read http://en.wikipedia.org/wiki/Can_opener
3. Dry ice is called "dry ice" because it goes through sublimation in normal pressure conditions - it goes straight from solid to gas, hence leaving its surroundings dry.
If you were to melt dry ice, you would have do it in a highly pressurized environment. If you ...[text shortened]... ere immersed in any other sort of liquid)... and you might also get crushed by the pressure.
Provided all airspaces in the body are equalised, pressure isn't a problem until oxygen becomes toxic at ~8 atm. CO2 is a liquid at this pressure at about -50C, so provided you can stick the cold for a few minutes, you'd swim around, then start depressurising and/or increasing the temperature and it would simply boil off. Have some burn cream ready though... (the freezing point of water doesn't change appreciably over that pressure range)
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