Have you ever done underwater diving?
I've done it a few times, but I didn't go too deep. The high ambient pressure limits how far down you go, unfortunately.
It sounds so interesting.  I have never done it but would definetly be interested in it.  I bet the things you see are beautiful
Diving regulator
A diving regulator is a pressure regulator that reduces pressurized breathing gas to ambient pressure and delivers it to the diver. The gas may be air or one of a variety of specially blended breathing gases. The gas may be supplied from a scuba cylinder carried by the diver or via a hose from a compressor or high-pressure storage cylinders at the surface in surface-supplied diving. A gas pressure regulator has one or more valves in series which reduce pressure from the source, and use the downstream pressure as
the remote Alaskan valley." Vidal notes that "normally numbers are what counts: what have you done, how many meters, what grade--That's relevant and important, too, but from my view it is equally important to see how things were done. To go in that style is a way of saying 'I am really alone.' If I go alone, I am alone." Although Vidal prefers this style, she does not believe that other climbing styles are less laudable, simply that this is