This video says about itself:
Filming Walrus With The Megadome – Blue Planet II – Behind The Scenes
The team use a very special underwater camera housing called the megadome which enables them to film in super wide-angle, allowing the audience to see both above and below water simultaneously. With a fully grown mother walrus to contend with, David Reichart the cameraman must take special care not to disturb his subject or risk a tusk in the head!
Scientists have uncovered a 10 million year old walrus fossil in Japan. Despite lacking the tusks that modern walruses are famous for, the fossil is still part of the same family as present-day walruses: here.
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