I've done plenty of ocean work without mind-controlling serpents. Once we drop below the water level, I can circle above and help anyone who can't swim very well. Remember, we have more than two dimensions to work with -- even if we stay close to the bottom, there is still above to think about.

[S'reee was calm and professional: this was her element. Sure, she'd have to watch her air if they were down for a long time, as the bubble affixed to her back wasn't really designed to go over a blowhole, but she was at home in the ocean, and was even starting to learn the seas in the area as part of her employment. And she had sonar and the natural sounds of the ocean to give her awareness.]