Three Brits are taking part in this weekend's Red Bull Cliff Diving world series in Wales.
Blake Aldridge, Matthew Cohen and Gary Hunt - the current world number one - have been out practising their dare devil moves.
Divers hit the water at up to 91km an hour after jumping off at a height of 27 metres.
One step wrong can mean the difference between life and death.
See pictures of their incredible dives here: