This video says about itself:
Long-finned Pilot Whale Species Identification
From New Scientist:
Pilot whales cuddle in the abyss
26 June 2013
THE abyss is a scary place. So perhaps it is no surprise that long-finned pilot whales like to stick close together when they plunge into the murky depths. New observations show that they often stay within metres of each other as they dive, and even stroke each other with their flippers.
Long-finned pilot whales (Globicephala melas) are social animals that live in large pods. They were known to keep together at the surface, but their behaviour underwater was largely unknown.
From daily The Guardian in Britain:
Royal Navy bomb explosions caused mass whale deaths, report concludes
Noise from underwater bombs caused 19 pilot whales to beach and die off the coast of Scotland in 2011, say government scientists
Wednesday 24 June 2015 14.09 BST
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