Oh, they attached cameras to the back of the whales. Nifty! Edit: Blue Planet 2 apparently did something similar; this article has more details: http://www.mir

Oh, they attached cameras to the back of the whales. Nifty! Edit: Blue Planet 2 apparently did something similar; this article has more details: http://www.mirror.co.uk/tv/tv-news/how-blue-planet-ii-team-11528095 http://www.mirror.co.uk/tv/tv-news/how-blue-planet-ii-team-1...