Each year, 20,000 dolphins are slaughtered in Japan, hundreds of them in the Taiji hunt alone. The few who survive the blood-red waters are sold into captivity, fated to spend the rest of their lives cut off from family and performing at zoos and marine parks.
But as this video shows, the suffering of even one of those dolphins is enough to spark outrage.
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.
Watch the touching video below (there's nothing graphic, but the content could be upsetting).