This 16 December 2015 video is by Richard Bosch in the Netherlands.
It shows a basking shark, swimming near gas platform L/11B, about 55 kilometer north of Terschelling island.
North America: Groups of basking sharks ranging from as few as 30 to nearly 1,400 individual animals have been observed aggregating in waters from Nova Scotia to Long Island. While individual sightings are fairly common, seeing large groups is not. The reason why the animals congregate has not been clearly determined, and observations of these aggregation events are relatively rare: here.
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