Board Thread:Off Topic/@comment-25396609-20190908002326/@comment-25396609-20191028034816

Pretty sure that you could use Wind Dust to make something functionally equivalent to a rebreather.

Although I THINK I may have seen a Semblance that let the user pull together disolved oxygen from the water around them, before.

An alternative is a hyrolysis Semblance, but then you have the hydrogen gas to worry about.