Moving underwater with SCUBA gear is bizarre. The gear wants to keep moving in the direction you were heading when you want to stop, and it anchors you to where you’re floating when you want to move. Currents and ocean swells move you around, and require lots of effort and precious oxygen to fight. Even your breathing affects how you move in the water, with inhales generally corresponding to floating and exhales corresponding to sinking.
Normally, these are just minor annoyances that people quickly adjust to. However, when these movement quirks are mixed with photography, they go from easily adjusted to and ignored, to something much worse. The constant movement means that there needs to be much more light than usual, just so that the exposure speed is fast enough to not blur the subjects while the photograph is being taken. Framing a subject is also much harder when the current insists on dragging you away, towards the pointy rocks right next to what you’re trying to photograph. The constant floating and sinking can be hard to adjust too, especially since holding ones breath is something that is not recommended, because of the multitudes of health problems that could arise.
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