Fishing is hard work, and catching bluefin tuna can be exhausting, and in Gloucester, Massachusetts, there is a special group of fishermen who have used rods and lines for generations to catch erratic bluefin tuna. They make a living from it, and bluefin tuna, which is scarce and expensive, is the highest quality ingredient in Japanese sushi, so the competition is fierce. The annual fishing season lasts nearly 10 weeks, and these most seasoned fishermen will drift adrift in the icy waters of the North Atlantic in search of "diamond in the sea" bluefin tuna. Someone has caught a big fish worth $20,000.