The Ghost Ship Visio possible

There once was a pirate more feared than all the rest!

No one knows exactly what happened to him, but all are assured he rests in his watery grave at the bottom of the ocean. Along with him, and his crew lies the world's greatest treasure. One item though is more valuable than all the rest... it is the Diamond Skull of Gartdoma!

Legend has it, that once a year the ghost ship rises from the ocean, at the place where it went down.

You, and your crew of pirate treasure hunters, have successfully pinpointed the exact time and location of this phenomenon and need to find the treasure before the ship goes back down to the bottom of the sea!