End scene thoughts, Spoiler alert
The director left it up to the viewer to decide his fate. First, he gives up and sinks down but sees a small boat above searching with a flashlight and swims back to the surface and grabs a reaching hand. That's what we saw, he was rescued. Or, was that his imagination considering he was about to drown. Besides, as far away as that ship was, they probably couldn't see the fire and by the time he gave up, there's no way a rescue boat could have reached him that quick. Considering the other inconsistencies, I just go with what I saw instead of making something up, he survived.
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