Captain Nemo

A sand tiger shark reveals sharp teeth underwater in Atlantic Ocean, North Carolina, United States. New research predicts the sand tiger and 9 other new species of shark including the great hammerhead and blacktip will migrate to the UK in the next 30 years. Photo: T3Media/National Geographic Channels.

Tiger Shark

South Carolina, United States: Photographer Tanya Houppermans captured what she described as a one in a million shot of a sand tiger shark swimming through a bait ball of thousands of fish. Photo: Tanya Houppermans/Caters News Agency.