Nine snowmobilers went through the ice at Clough State Park in Weare on Saturday, and all made it out alive.
Nick Amerena, of Londonderry, said he, a cousin and a friend crashed through the ice on a flooded part of the snowmobiling trail about 10:30 a.m. Saturday.
Amerena and his cousin escaped the freezing water, but their friend was in the water for more than an hour before rescuers got him out. Another snowmobiler who tried to help also went through the ice and was treated by an ambulance crew at the scene.
The man, whose name was not released, was flown to Dartmouth-Hitchcock Medical Center in Lebanon and treated for severe hypothermia.