Adrian Grenier is ditching his Entourage boys and taking a dive into the ocean to help save the bluefin tuna. Ironically on his hit HBO series, Grenier's character Vinnie Chase played Aquaman, so it looks like this may be his real life chance to become a superhero in the ocean!

The blue-eyed hottie slips into his wetsuit, straps on his goggles and gives us an up close and personal look under the sea at the fish he says "we're eating ... to the brink of extinction."

Who knew bluefin tuna, some of the fastest fish in the ocean, were facing extinction? Thanks to Adrian, we do now.