Board Thread:Off Topic/@comment-25396609-20190908002326/@comment-36926079-20191028032247

Sentry 616 wrote: EmBELLEm wrote: could breathing underwater be a semblance? Eh, you're better off with a set of gills as a Faunus trait or straight up SCUBA gear. Breathing underwater seems... iffy.

The air bubble thing fails because of carbon dioxide. He never specified how long it had to last. :p

We also don't know if they have sophisticated scuba gear, and not everyone can have gears.