Sharks are most aggressive and most active in the dark, but the fact is, we know very little else about the nocturnal nature of these creatures. Now, armed with the latest in infrared thermography cameras and night vision technology, a team of divers travels around the world, and descends into the sharks dangerous after-dark hunting grounds. Their goal is to learn more about how Great Whites, Six-Gills, and Tiger Sharks behave after the sun goes down. Shark Week is back!