Possible Pirate Caverns map found in TBmHC.
The opened treasure chest with a pillow reading "OTAKU" in it.
The desk in the office-like area seen from above, with a key in an opened drawer.
The Face under the same desk.
A bank safe surrounded by caution tape with walls similar to Undying's room.
The view from the elevator, looking into Undying's room. Notice the yellow liquid on the ground.
A view of Undying's room and possibly other parts of Pirate Caverns in a 3D modeling program. Notice how Undying is bending down. Also notice that it repeatedly mentions a bank safe.
The same model from the 3D modeling program at a different angle.