Fan Casting Oasis

It's a steampunk story about pirates. Legend tells of a lost underwater palace called OASIS. A structure made entirely of gold, silver diamonds, pearls and the finest corals that would make Poseidon himself envious. The palace was made by the first band of Pirates led by Thadeous Carver. Carver became consumed by greed and he wouldn't allow anyone near the palace. To ensure no one would steal any of his treasure, he kidnapped scientists to help him create a Frankenstein type of Shark creature he called Golgotha to protect the palace and his treasure. However the sea eventually claimed the palace as well as Carver but legend has it that the palace is still standing, the treasure remains untouched, and The Golgotha is still guarding the palace from uninvited guests. Now Jason Thrawl (son of the famous sailor Robert Thrawl) and his gang of pirates have recovered the map for this palace and the story is them finding the palace.