Which 5 (or 6) drowned?

I think in reality 6 actually drowned. Four were students and 2 were crew. However I can only count 4 (rather than 5) on my moribund death watch. Alice (the skipper's doctor wife), Girard, the Cuban with a lousy Puerto Rican accent, but good stories, Gil (who's "wake-up call" didn't work in the end), and lastly, Dean, the real hero of the lot who went down trying to save others. That makes 2 crew and 2 students. Of course there was the dolphin, too that Frank popped thinking he was firing at his father, like Dick Cheney thought his hunting pal was his Dad, when he shot him in the face. But was there a fifth unlucky sod looking for Davy Jones' locker?
In real life, the skipper went out several years later with a new boat and paying students and guess what happened. That's right. You guessed it.
In 1965, he again developed sea fever and bought a 130-foot ship, the Verona, for use as a floating school. This time, instead of a white squall the ship caught fire near the west coast of Central Africa. The fire destroyed the vessel, but this time all aboard escaped. Guess he had a relaxed drinking/driving the ship policy on the 2nd voyage, too. His students were safer patrolling the jungles in VietNam than they were signing aboard one of Dr. Sheldon's voyages.