One of the largest sharks ever recorded -- a great white named El Monstruo -- was captured in Cuban waters in 1945. Multiple sightings of huge sharks around Cuba puzzled scientists but the island nation has since been closed off to outsiders. Now, two teams of researches have finally been granted permission to delve into the mystery of Cuba's gigantic sharks. To the south, a team looks for a massive great hammerhead known as the Queen while the hunt is on for another El Monstruo off Cuba's north shore.