Tonight: Bahama Blue

From network episode descriptions:

Bahama Blue, Love Nature network – “Open Water”
Open Water makes up nearly half of the area of the Bahamas, but houses its most elusive species. These creatures must be able to swim far or fast, to search for food, mates and shelter. These iconic species: Oceanic White Tip Sharks, Sperm Whales and even the reclusive Blainesville Beaked Whales are some of the deepest hunters on the planet. Schools of fish and flocks of birds exploit every advantage in this environment, whether a patch of seaweed or a rocky outcrop.