S2, E4: It’s week five of the Atlantic Bluefin Tuna season and the fishermen of Gloucester; Massachusetts; are facing a dangerous new foe; with great white sharks swarming into local waters. But; with a single Bluefin worth up to $20;000; the captains are determined to stay out on the water. When huge great white sharks attack a local swimmer and slam into the side of tuna fishing boat Christina; it’s clear that these man-eaters could be their most dangerous challenge this season in their bid to catch Wicked Tuna.