white water

What unfolds after the ramp-drop is dynamic disorder - a confused kaleidoscope of brightly coloured boats powered by paddles brandished frantically, tearing through unforgiving white water.

She said: "It's all white water running round there. It's like a river."

Moves like the turtle roll or duck dive — techniques that help you push your board through the white water — can help.

"There was just an eruption of white water and it was evident that the dolphins had picked up on the porpoise's presence basically as soon as it entered the bay," said Mr Pedley.

They typically appear as darker, narrow gaps of water between areas of breaking waves and white water.