I used to be an avid S.C.U.B.A. diver.
For fun, volunteered as an assistant instructor, and all the instructors would give me their shaky, unsure divers to train. I loved seeing fearful people "get it" and become accomplished, passionate divers.
Was trained to be a "Diver Medic" for open-water dive rescues. Fortunately, never needed that training,
Was fortunate to be invited to do some Mid-Ocean research dives, with the bottom being thousands of feet down, out of sight faded into pitch black. It's truly diving in inner-space. Awes to the core...
As a kid was diving with some people. 2 huge sharks cruised up to us, circling us. One of the older guys grabbed me and put me between him and the sharks in a panic. I just relaxed, figuring as long as he didn't turn off my air or literally shove me into a sharks mouth, I'd be ok (plus I could still stick him with my knife :D). Later, he kept telling me to tell everyone he was just "joking". Haha. Nope.
99 % of dives are the most amazing, wondrous, ecstatic experiences that you can possibly have.
I still miss diving, and it's one of my "safe places' to go to when I'm doing EMDR. Being in the water like that, with air supplied, interacting with wonderful animals is even better than being on land. (I don't know why our ancestors chose to leave the ocean :D.)