Swiss wildlife photographer Franco Banfi and a team of scuba divers were following a pod of sperm whales off the coast of Dominica Island in the Caribbean Sea, when suddenly the large creatures became motionless and fell into vertical slumber. This phenomenon was first discovered only in 2008, when a team of biologists from the UK and Japan inadvertently drifted into a group of sperm whales floating just below the surface, completely oblivious to their surrounding. It was only when one of boats accidentally bumped into one of the whales, did the animal woke up and the entire pod scurried off.