Pretty fun game, but...
Upon collecting 3 items, I received the command to return to the ship, which I read as "fly out of the water and land on the ship as a helicopter would". Upon succeeding, I however did not complete the mission. I couldn't move and ran out of oxygen.
Not to say it wasn't funny, but I kinda feel punished for being stupid. The level was pretty long.
The preceeding gameplay was fun though, swimming and collecting items feels smooth.