Undercurrents (1973)

In the clear waters of the Gulf of Mexico, the undulant beauty and violent potential of underwater life are carefully balanced within the reef community. The coral, the fish, the crabs all live within the balance of a delicate web of life connecting all creatures of the deep, from tiny microscopic plankton to the 2000-pound manta ray and the mighty sailfish. This web of life connects all sea creatures and man by his presence beneath the sea, threatens the very existence of life within the oceans.

Unfortunately the movie Undercurrents is not yet available on HBO Max.