Yo-ho!
You see that the dark mass is in fact a wrecked sailing ship. It must have been down here for centuries!
You go in to explore.
You find a small casket in one of the rooms. Your curiosity gets the better of you, and you carry it back to the underwater cave.
Once you're out of the water, you use a piece of driftwood to pry the casket open. It takes a bit of elbow grease, but you manage to do it.
Inside you find...
Written by on 13 September 2014