These are the “barriers” used by trainers at SeaWorld to protect them from contact with the killer whales, after OSHA strongly suggested (or did they rule this in court?) that they may not be in contact with the whales without distance between human and orca. This is from SW San Diego I believe,and it looks as if it is built into the concrete but I’ve also seen a video where the trainers actually grab the barriers and place/hook them on the edge of the pool right before they do this, then remove them when they are finished. This does not look to me like it would save a trainer from being pulled into the water by a killer whale at all.
They don’t even follow the rules and use these hardly ever anyways. Seaworld has been known to blatantly break rules set for them by court orders during their shows.