Thinking specifically of scuba diving. It requires a ton of equipment and training and can still be dangerous. In movies there’s always some kind of little gadget that allows people to breathe underwater without all that equipment. Why can’t we build a simple mouth piece with an oxygen canister attached that we could carry around and breathe into when we need?
In: Engineering
Such canisters:
* can only carry a small amount of air,
* they don’t mittigate the issues of the Bends or Nitrogen Narcosis if used enough to allow you to do what SCUBA lets you do,
* still have to have a regulator so that you can suck the air out of them without them venting their contents (which is the key technology of SCUBA)
* all the extra equipment and training SCUBA divers get are to reduce the risks inherent to being deeper underwater than humans are evolved for
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