Brave surfers who rode a giant wave off the west coast of Ireland are refusing to give away its location.
One of the six-man team, Briton Andrew Cotton, first spotted it several years ago while on board an Irish Coast Guard helicopter after being rescued from a surf accident off Mullaghmore, Co Sligo.
The terrifying-looking wave, dubbed 'Prowlers', was reportedly up to 50ft high on Tuesday when the Irish, British, Australian and South African surfers ventured out.
Al Mennie, one of the team and a pioneer of big-wave surfing, said for "selfish reasons" they'd keep the exact location a closely guarded secret.
"The only way I can describe it is that the waves were detonating when they hit, exploding when they hit the water," he said.
"You could surf the wave and get in to the wave and feel the violence of the wave."
It is the second huge wave discovered off the west coast after Aileen's at the foot of the Cliffs of Moher hit surfing headlines a few years ago.
The wave appears after massive swells kicked up by Atlantic storms and depressions hit a reef at least two miles out to sea from Donegal Bay. The surfers described the spot as an underwater mountain.
The water was said to have been just six feet deep on top of the reef when the biggest waves pounded down on the unidentified spot.
The team rank Prowlers as one of the biggest waves in the world, on a par with the Mavericks off the Californian coast, only made up of much more water, or heavier, according to Mennie.