A man dressed in uniform is lying face down in the ocean with a backpack on. What happened to him?
he jumped out of a helicopter (or some other aircraft :P) and tried to open a parachute (which is supposed to be a backpack I guess...) and it uh...kinda failed to open? So he died...whoops.
But, I don't know
how he was going to survive anyways because he jumped out in the middle of the ocean...like even if the parachute worked...
Scuba diving (most likely surface scuba diving) with a backpack on.
He's lying face down in order to see underwater, and the uniform in question is, in fact, the diving suit he's wearing.