This video, made by the Woods Hole Oceanographic Institute, shows great white sharks near Guadalupe Island, Mexico. In 2013, Woods Hole researchers equipped a Remote Environmental Monitoring Unit, A.K.A. a REMUS-100 robot, with five cameras to find sharks and tag them. When the researchers sent REMUS underwater in Mexico, they got an eyeful of the sharks' territorial and predatory behaviors. The sharks snuck up under the robot in much the same way they stalk and nab seals, the video explains.