Just as it sounds, we need a scuba-helmet (or diving helmet?). It would be made of glass, and have durability for each tick of breath needed under water. Upon making it, it would be a helmet which works when worn (and maybe have a glassy view, like jack-o-lanterns have their own view).
As for how it works, here are a few ideas:
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This build requires 4 glass, and would have limited breaths. Upon failure, it breaks with a glass sound, and normal breath-holding resumes.
I will edit with more ideas, but I just ran out of time. Above is the most basic idea for it I had.
If you play on a bukkit server, you can use the PumpkinDiver plug-in to do something like this. By placing a pumpkin on your head you can stay underwater 10x longer than usual.
Maybe it could break when you go a certain number of blocks below the surface, like water pressure. Or you could have some sort of lightsource on it so you can see the bottom, because it's very dark
As for how it works, here are a few ideas:
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This build requires 4 glass, and would have limited breaths. Upon failure, it breaks with a glass sound, and normal breath-holding resumes.
I will edit with more ideas, but I just ran out of time. Above is the most basic idea for it I had.
Thank you and welcome to the forums!
-Edgar Allan Poe
Okay then, thanks.