Scuba Cachet for Xmas Island Fish Issue in May 2013

The FDC cachet of the Christmas Island Fishes issue, released on 21 May 2013 has a scuba diver as its central feature. Unfortunately, the scuba diver in the design does not seem to be wearing any buoyancy control device (BCD), which is important for safety as well as buoyancy control.
The fish featured in the stamps are the Cocos Angelfish, the Ladder Wrasse, the Redtooth Triggerfish, and the Red-striped Pigfish.