CONCORD — Dive teams searched Walden Pond Monday for the second day for a swimmer who disappeared after a Sunday afternoon swim with his wife and friend.
Authorities also combed the network of trails around the historic pond for the 63-year-old Lincoln man, who swam at Walden regularly with his wife.
“They swam here almost on a daily basis,” said acting chief Jack Kennedy of the Concord Police Department. “They were experienced swimmers.”
The trio began swimming about 5:30 p.m. When the women decided to return to shore, the man decided to continue.
“At one point during the swim, their routes diverged,” said Dave Procopio, a spokesman for the Massachusetts State Police. Police said the man had earlier told his wife he might try to swim the length of the pond.
The man was reported missing about 6:45 p.m., and teams searched well into the night before resuming Monday morning. His name was not released.
Dive teams used sonar to search the glacial pond, which is 100 feet deep in the center, while officers on horseback and all-terrain vehicles searched the woods.
“We have not ruled out the possibility that he made it out of the water and suffered some form of medical distress on land,” Procopio said.
Mark Cotreau, the fire chief in Concord, said teams had begun searching previously covered ground in the woods. Dive teams were focused on the left side of the pond, where the swimmer was last seen.
The search was suspended around 3 p.m. and will resume Tuesday morning. The state park, a popular spot for distance swimmers, will remain closed during the search.
A 7-year-old boy was rescued after nearly drowning in the pond in July. The popular tourist destination, where philosopher Henry David Thoreau lived for two years beginning in 1845, draws some 600,000 visitors each year.