I have several videos of cormorants, and have seen them about 50-60ft down. The most memorable was during filming for a class. You see me take off my mask, and then this bird swims down into the frame right in front of me. The camera then comes off me and tracks the damned bird as it pokes around the sand and shoots back to the surface. Camera pans back to me just as I finish clearing, completely unaware of what just happened! During video review, they said "Oh yeah, sorry about that, we got distracted."