The body of an adult male swimmer was retrieved by a diver after being reported missing at Walden Pond in Concord, Massachusetts on Sunday afternoon, according to Massachusetts State Police.
The man, who was about 30, was under 12 feet of water for over an hour before being pulled from a section of the pond called Thoreau's Cove around 6:00 p.m.
Responders tried to revive him and he was brought to Emerson Hospital but state police issued a statement at 11:37 p.m. Sunday that confirmed the man's death.
Bill Noke, the captain of the Concord Fire Department, said the man's disappearnce occurred during the time of day when the life guards have gone but Walden Pond is still open to the public.
"I believe they leave somewhere around 6:00 p.m.," he said of the life guards. "So it was just after they left."
Noke said he believes the victim was visiting the pond, which spans more than nine football fields in length, with his friends. A family member confirmed that he and his friends were attempting to swim across the pond.
On the beach at Walden, there's a sign posted that says "the area beyond the ropes ... is inherently dangerous. swimmers assume full risk and responsibility." This is where the victim's body was found.