This video says about itself:
First underwater video of True´s beaked whales
7 March 2017
View the full academic article here (complete with more images).
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This video is from the PeerJ Publication: “True’s beaked whale (Mesoplodon mirus) in Macaronesia. PeerJ 5:e3059 https://doi.org/10.7717/peerj.3059“. This group was formed by three adult or sub-adult whales. Social behavior of this species is still unknown but the group seemed to dive in a coordinated manner, as has been observed in other species of beaked whales.
Credit: Roland Edler.
Beaked whales are very rare in the North Sea.