Continuity mistake: In the opening scene, they are on a boat that is rocking a lot in a storm and approaching another boat. But the seas are calm in the view of the boat they are approaching. (00:01:45)
Continuity mistake: People are often shown listening to the radio at completely different times of day to the times shown on the boat.
Chosen answer: They can be seen in a couple of long shots of the ship's prow as the DJs shelter there. It's reasonable to assume, given that they were present when the rescue flotilla arrived, that they were picked up as well, just off-screen while the film focused on the main characters.
Tailkinker