Focused on the illegal trade of Mexico's Sea of Cortez totoaba fish swim bladders (for folk medicine) to China & the killing of other species (most notably the vaquita porpoise/whale) though indiscriminate use of vast ocean nets.
To the rescue:
Sea of Shadows (SOS) illustrates a few of the challenges the Sea Shepherd group & other groups face in saving the ocean environment from destruction & extinction. The adversaries are at times ruthless, well funded (some through organized crime), and always deceptive. Sea Shepherd & other groups on the front lines of saving the environment have at times been criticized for aggressive, confrontational tactics, but those committing the crimes are willing to even kill for their gains. Like the similar illegal drug trade it's literally a war.
Review of Sea of Shadows
