Four Britons attempting to row across the Atlantic for charity have been rescued by the U.S. Coast Guard after their boat capsized, British officials said.

The 29-foot boat of rowers Chris Jenkins, Tim Garrent, Wayne Davey and Joby Newton capsized 420 nautical miles east of Cape Cod early on Saturday, while the men were in the boat's two cabins.

"The crew have been taken aboard the Gulf Grace at 8 a.m. -- we understand all are relatively safe and well, but suffering slight hypothermia," British coastguards said in a statement.

The Britons had been attempting to row from New York to the Isles of Scilly to try to break the record of 55 days set in 1896 by George Harboe and Frank Samuelson on a route that has only been successfully completed six times.

The four men, who had been expected to each burn around 10,000 calories a day rowing two hours on, two hours off, day and night, had so raised nearly 75,000 pounds for four different charities after leaving New York on June 1.