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Brothers become first to swim world's biggest whirlpools

Three brothers from Penrith have become the first people to swim across the two biggest whirlpools in the world.

Jack, Calum and Robbie Hudson swam across the Saltstraumen whirlpool, which is considered to be the fasted in the world, before swimming across the Moskstraumen, which is the largest in the world.

Both whirlpools are in Norway and are powerful because of the way currents in the sea meet the shallow land-shelf, just below the water.

The current is so strong in the two whirlpools that that it can engulf boats so the brothers had to wait until the currents were less dangerous before taking on the two swims.

They said they did it to raise awareness of conservation issues in the area as well as to give themselves a challenge.

Last year the three brothers swam the length of the River Eden in Cumbria from its source to the Solway.

WATCH: Calum, Robbie and Jack Hudson after one of their record breaking swims

"I'm very happy to say that at 6.35pm Monday 22nd we became the first people ever to swim across the Saltstraumen, the 2nd biggest whirlpool in the world. The margin between success and the abyss turned out to be less than 45 seconds with the current turning in a second and the central whirlpool appearing just as we clambered back into the boat. Setting out from the South side we crossed the first stretch with relative ease but on the final stretch the currents swirled and threatened to drag us below the bridge and into the larger vortexes below, as Jack and Calum made it to the rocks we turned around to see big brother Robbie battling hard against the currents making the rocks just in time. After a quick hug Knut our captain called us frantically back to the back and as we swam out and clambered aboard the currents turned, spinning the boat in a full circle. Despite the danger it was no accident that we made it just in time.

"We set off at 8.00am (on Wednesday) and at 10.31am we became the first people ever to swim across the Moskenstraumen. Pods of Killer Whales had been seen in the maelstromas early as 4 days before and this was an ever present fear, despite posing little threat to humans, the constant thought of a 6 ton bus sized black shadow of an adult bull Orca appearing beneath us was psychologically challenging to say the least. But with the Norwegian weather gods looking on favourably we crossed the 8km stretch of water together as brothers. It was the most incredible experience of my life, looking up to my left and seeing my little brother Jack dwarfed by the cold black expanse of the sea and the distant colossal mountains of Norway's rugged coast and breathing to my right and seeing giant Lion's Mane Jellyfish floating below Robbie as Sea Eagles patrolled the islands and shoals of fish swam beneath us. I felt that we'd tapped into something primal, truly experiencing one of the wildest corners of the world on it's own terms, through wild swimming we'd directly immersed ourselves within the environment and seemed to merge into the sea as we swam onwards."

– Calum Hudson