A giant whale speeds beneath the waters off the Bay of California in Mexico. This underwater bullet is a sei whale. It measures 15 meters in length and weighs 20 tons. The habits of sei whales are relatively unknown. Since they swim at speeds in excess of 60 kilometers per hour, it’s been difficult to observe them. How can these whales swim so fast? Captured on film is footage of a sei whale swallowing a school of anchovies in a single mouthful with lightning speed. The secrets of the survival strategies of this fast-moving behemoth are revealed.