VIDEO: Killer whales swim near emergency response vessel on the North Sea

These amazing pictures show a pod of killer whales in the North Sea as they circle an emergency response vessel.

The footage was filmed 155 nautical miles north east of Aberdeen by chief officer Graeme Hately on board the Grampian Protector.

The pod of killer whales was filmed in the North Sea

The pod of killer whales was filmed in the North Sea

Graeme estimates there were up to 30 orcas in the area at the time, and based on their behaviour believes they were hunting for shoals of fish.

One of the frames, taken underwater using a GoPro camera attached to a buoy and a weight, briefly shows a mother and a baby swim past the side of his vessel.