A scuba diver.
a snorkeler. Or they could be an underwater hockey player.
scuba diver, lifeguard, underwater recovery, underwater conscruction, professional swimmer.
It is completely possible to cry underwater. Because tears are comprised mostly of water, it would be impossible to see them on a swimmer's face while they were underwater.
A girl or woman swimmer can be called a "naiad."
no
Ian Thorpe from Australia - The "Torpedo"
Nageur
Ian Thorpe - an Australian swimmer - was sometimes called thorpedo.
An underwater bubble blower.
Before starting shooting "H2O" she was not; she worked to improve her swimming skills, but due to the fact she played a mermaid in the production and had to shoot lots of scenes underwater, we can assume she's a pretty good swimmer.
Diving does not consist of two separate words together, so it is not a compound word.