From Tekkenpedia

Pirate's Cove
Walls	Yes
BG Music	Gold Rush

Pirate's Cove is a stage in Tekken 5. It is a cavern filled with an enormous amount of gold and jewels. Stalagmites and stalactites are in this place. Flashing red lights, some skeletons, lit lanterns, treasure chests, and a pirate's ship can also be seen in this place. If you hit the floor, gold coins will fly everywhere.

[edit] Trivia

• Paul Phoenix's and Nina Williams' both fight their sub-bosses here during story mode.