This is the moment a French helicopter tailspun out of control and crashed down into a pond while collecting water to fight wildfires in Brittany.

The aircraft, a Morane 29, was carrying out a tricky water-scooping operation on Sunday evening when it suddenly manoeuvred out of control and slammed into the surface of the pond on its side.

Dramatic footage captured by a shocked onlooker shows the chopper lowering a flexible 'Bambi bucket' into the water moments before the tail dipped and the aircraft went into a violent tailspin.

The person filming could be heard yelling 'Holy cow' repeatedly as the helicopter crashed.

Incredibly, both the pilot and the firefighter on board survived and managed to escape the wreckage.