North Sea workers are becoming used to witnessing creatures in the wild.
But even so, the crew of an emergency response vessel were thrilled this week when they came face to fin with a pod of killer whales.
The Grampian Protector was stationed around 150 miles east of Aberdeen when the close encounter occurred.
And the ship's chief officer, Graeme Hately, was quick with his video camera to record the event for posterity.
The pod of between 30 and 35 orca included a mother and her baby, who were swimming under the waves near an oil platform.
And you can watch it all here.
Mr Hately has more than 20 years experience working offshore and has been with the Grampian Protector, owned by Aberdeen-based North Star Shipping, for the last 11.
Yet he was as delighted as anybody else at capturing the majestic scenes.
He said: "We were all stunned to see so many of them at the same time. We were completely surrounded by them.
"This is one of the most spectacular sights I have ever seen.
"I was just about to turn in and get some sleep, but I always tell the guys that if anything interesting happens, they should give me a shout.
"And it doesn't get much more unusual than a school of whales alongside your ship."
The North Sea Orca video comes after a smaller group were spotted in the Firth of Forth earlier this year. It was only the third time on record that the animals had been seen ii the Firth.