KODIAK -- A National Transportation Safety Board investigator says a floatplane sank after hitting a rock during a takeoff run near Kodiak.

KMXT-FM reports one of the three people onboard suffered mild hypothermia, but the other two were unhurt.

Investigator Clint Johnson says the De Havilland Beaver owned and operated by Island Air of Kodiak was carrying a pilot and two mechanics on a post-maintenance test flight when it landed Tuesday afternoon in Long Lagoon for testing. It hit a rock as the pilot attempted to take off, punching a hole in one of the plane's floats and causing the aircraft to sink.

The pilot and mechanics got out and were rescued after about 20 minutes in the water. Crews were working to retrieve the plane.

Johnson says the person with signs of mild hypothermia was met by emergency responders and treated at the pier.