Guadalupe Island, Mexico a volcanic island in the Pacific Ocean, is one of the few areas of migration of the great white shark. Its clear waters offer great visibility to observe the majestic sharks with sharp teeth, and anti-shark cages are submerged regularly. During one of these dives, last September, an incident occurred to disrupt observations. In fact, a female nearly 5 meters entered in one of the anti-shark cage occupied by divers. For several tens of seconds, the shark was trapped in the metal structure without being able to break free despite his agitation. The boat crew finally decided to take up the cage and tie a rope around the tail of the shark in order to then release the lowering again the cage into the water. Fortunately, nobody was hurt. Note that a similar incident occurred recently in the same observation area. The shark had been out of the cage after opening it.