And while proponents of the hunt market the massacre as a Japanese tradition, dolphin drives have only become commonplace in the last few decades - and the Taiji hunt in particular is driven by a handful of local men who are getting rich off the killing.
"These are the cruelest 50 men in the world right here," O'Barry says. "Shame on the captivity industry for not being here and doing something about it."
"They don't represent the Japanese people," he later adds.
You can help stop the Taiji dolphin hunt by donating to The Dolphin Project, signing a petition or even traveling to Japan with the group's cove monitoring program. Visit The Dolphin Project to find out more.
Watch the touching video below (there's nothing graphic, but the content could be upsetting).