JACKSONVILLE, Fla. -- A Navy sailor fell 40 feet from a helicopter during training exercises, according to Bill Austin, with Naval Station Mayport.

The incident happened as a Mayport squadron practiced Tuesday evening in the river near NAS Jacksonville, Austin said.

At some point during the exercise the search and rescue swimmer became detached from the hoist connecting him to the helicopter and fell into the water below.

A boat, which Austin said he assumed was a Navy vessel, rescued the sailor who was taken to Orange Park Medical Center for evaluation. There is typically a Navy boat in the area while these exercises are going on as a safety precaution, and Austin said the sailor's injuries did not appear to be life-threatening.

The Navy is now investigating what caused the problem with the sailor's hoist.