This is the terrifying moment a breaching whale knocked two men off of their boat into the ocean.

Colin Yager and his brother were fishing in Portsmouth Harbor in New Hampshire, USA, on Tuesday, July 23, when they captured the moment on camera.

Video shows the massive mammal lunging out of foamy waters and landing on the back of a fellow small boat.

The two passengers, stood near the front of the boat, were flung into the water.

Colin and his brother immediately raced to help the two men and managed to get them to safety on their boat.