Aquathlon is an unusual Combat Sport invented in the Russia, originally as a way of training navy divers in underwater self-defence. Two competitors, each wearing a tag around one ankle, dive to the bottom of a swimming pool. The first person to remove his/her opponent's tag and reach the surface is the winner.
So far Aquathlon has yet to catch on outside Russia and the Ukraine which is a pity because anything that features young women grappling in onepiece swimsuits deserves more attention.
This is a compilation of clips and a slightly different version to the one I have on Youtube.
Since creating that video I found some more clips so here's a little bonus.