had been swimming underwater for about a minute before breaking the water's surface. He then descended to the bottom of the pool and lay there for five minutes and 14 seconds before a rescue ...

The marine photographer who captured the footage said it could be the world's first recorded sighting of a black seadevil ...

It is a wave-like function that helps swimmers rotate around the short-axis. Think about how the waves of the ocean move: this is also how swimmers move down the pool in these two strokes.