BOSTON >> Authorities say three people have been rescued from the frigid waters of Boston Harbor after their tugboat sank.

The 51-foot tugboat Emily Anne started taking on water at about 6 a.m. Tuesday.

A Coast Guard spokeswoman said the boat started going down at the end of the North Channel, in 44 feet of water.

Capt. Joseph Maloney, Jr., of the Boston Harbor Pilot Association, was about a half-mile away when he heard the distress call and made his way to the scene. By the time he got there, the tugboat was submerged and three men were in the 37-degree water.

He pulled all three on board and took them to shore.

He says they were in the water for only a few minutes and appeared to be in good shape.