The treasure chest is an item in the game Aquanaut.
The treasure chest appears as a gold coloured box with a gold coloured cover. Their are two fins pointing up on the sides of the cover, and on the lock is the head of the superhero from Pixel Pop.
The treasure chest is the main objective of the submarine in Aquanaut. It is located at the very end of a level, where the player has to brave many hazards and enemies. Touching it will make the chest open and end the level. No points are awarded, though there are many treasures in there.
The lock on the treasure chest appears to be a slightly altered version of the head of Norman Noggin from the game Headcase.