Free-diving is the only way to get close enough to intimately study Sperm Whale behavior—it comes with a price though.
A free-diver’s arm was paralyzed by sonic whale clicks — for four hours! “When you free-dive with them, there is an amazing paradigm shift”. “Scuba doesn’t work, … too loud, submarines don’t work, robots, same thing.” “The clicks are like four million times louder under water. The energy from the clicks is so intense, it begins to heat up the free-diver’s body.
“Within the audibly heard clicks is a extremely sophisticated form of communication — maybe more so than human communication.”
Sperm Whales Clicking You Inside Out — James Nestor at The Interval – YouTube