Corrected entry: When the balloon is inflated inside the sunken pirate ship and it resurfaces, where did all the dead pirates go? True, some had jumped into the water as the explosion occurred, but there are none who swam to shore, nor are there any bodies. Also, I doubt that the ship was under long enough for ALL the bodies to just disappear naturally.
Mysterious Island (1961)
1 corrected entry
Directed by: Cy Endfield
Starring: Joan Greenwood, Michael Callan, Michael Craig, Gary Merrill
Visible crew/equipment: When the five men are going up the mountain, a crew member is seen beside a big rock, at the bottom left of the screen. (00:33:50)
Elena Fairchild: I'm going to ask Captain Harding to marry us.
Herbert Brown: That'd be wonderful, if he were only a minister, but he's not.
Elena Fairchild: He's a captain, and captains can marry people at sea.
Herbert Brown: He's a land captain, not a sea captain.
Elena Fairchild: Well, we're on land, aren't we?
More questions & answers from Mysterious Island
Correction: The fact that you doubt it doesn't mean in can't happen. They are in warm tropical waters, so a putrefying body would fill with bacterial gases and float away from the wreck, providing a free lunch for hundreds of species of predatory or scavenging fish, worms and crabs. The ship would be clear of bodies within days.