This was recorded version 4.0, don't know if it still works.
A glitch I found today by jumping straight up from the water against one of Fontaine's cargo ships.
I do not know how to exactly replicate this and I know it doesn't stop until you plunge or teleport out of it.
I think it's only possible with characters that can do the juming dolphin thing.
So only traveler and probably other Fontaine characters. But I may be wrong about this.
Funny how this is my first new original upload after months of not uploading