• jrwperformance @lemmy.world
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    2 days ago

    You can’t breathe when you are too deep. The outside water pressure is too great for your diaphragm muscles to overcome. I remember a Bill Nye Science Guy video from middle school where he tried to use a garden hose as a snorkel. The further down you go, the less you can breathe.

    Also, wouldn’t a big-ass bag of air be crazy difficult to keep under water? Try keeping a beach ball under water…

    • nibbler@discuss.tchncs.de
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      2 days ago

      The garden hose as a snorkel is completely different. The air pressure is at above sea-level pressure, while your lungs are compressed by the weight of the ocean - so depending on your depth.

      These bags, as depicted, are also under pressure at roughly the same depth as your lungs. So you can easily breath. It’s just that the volume of the air gets smaller as you press the bag under water.

      To overcome the force pushing the bag upwards, you can use stones or lead, like scuba divers do. It might be less flexible as the volume of the bag changes with depth in contrary to modern scuba diving equipment. So surely depth will be limited, but it’s not as bad as you depict it.

    • Honytawk@feddit.nl
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      2 days ago

      It is probably more surface diving.

      Since it are soldiers, I suspect as a sort of stealthy approach to enemies. Which would only require a depth of 2m maximum.

      • kwomp2@sh.itjust.works
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        1 day ago

        No depth of 2m, at all. No enemies no approaching no stealth. It would be lovely if we all spend the 20sec to verify a tiny bit. I read a total phantom discussion trusting you guys :)

        • Dasus@lemmy.world
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          17 hours ago

          Yeah, it’s not ancient specialised scuba marines, but ancient “ohno help me I can’t swim”

    • Gladaed@feddit.org
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      2 days ago

      Yes. It would be difficult to keep und water. But it is also pressurized by the water pressing on it so I would expect breathing to be doable.