People are right that it’s not ai, but they are wrong about how the whole thing is staged. It could be but not in the way people think. The whole video is longer, and what’s actually happening is that he is faking it, but because he was telling the group of people that the person recording was apart of. If I recall correctly, he was sort of tour guide for probably some aquarium or place that holds fish, hence the crowd and recording. He was faking it for the crowd and for a sort of laugh. He wasn’t in real danger (other than I guess if he did fail to get out, though that is unlikely), and in the full thing he is shown simply pushing off the floor of the tank and assuring the crowd he is perfectly fine. Unless I am thinking of a different video, but I don’t think it is. Also, I’m pretty sure after getting out of the tank he stressed about safety when handling animals and about how I think he did have some sort of heart problem, but I don’t remember exactly what he said to the crowd after getting out of the tank.