This films reveals the extraordinary variety of life found in the vast blue expanses of the
open ocean. Here, all the action takes place in a 10 metre deep band of water, just under the surface. Many species use this section of water to migrate and hunt while others use ingenious ways to stay hidden where there appears to be no shelter.

Short-finned pilot whales are known as the "Cheetahs of the Deep" for their ability to dive at high speed to hundreds of metres in search of prey. This film documents the lives of these highly sociable mammals and reveals a complex social behavior which is unique to this species.