Its behind you! This is the incredible moment a scuba diver came seconds away from being swallowed up by a giant whale shark. Marine biologist Simon Pierce, 34, and his diving pals were having a whale of a time before they narrowly avoided being sucked into the whale sharks enormous mouth. The 25-tonne beasts were feeding on billions of microscopic organisms plankton when they approached the diving group. Keen diver Simon, from New Zealand, whipped out his camera and caught the jaw-dropping snaps of the close encounter in the picturesque waters off Isla Mujeres in Mexico.