In the version I have at the end he dives deep, sees the dolphins and swims away from the rope. The understanding is that he kills himself. Is there a different ending in the other version?
Yes, the last frames of the film are different. He swims away from the rope to the dolphins, than the last frames show him on the surface riding one, while one or two do flips. The viewer is left to contemplate. does he stay and go for the big swim or do his friends give a ride to the surface and a life with his girl and child some day.
Cheers, Don