Hidden within the depths of our oceans are secrets about our past, our planet and life itself. At last, an international team of underwater explorers is ready to dive in and discover them. This spectacular, surprising series combines archeology, geology, marine biology and anthropology with all the energy and excitement of a good thriller. Astonishing footage captures the full beauty of the alien world and video diaries vividly reflect the teams stresses, successes, disappointments and dangers. From discovering the truth behind rumors that the Mediterranean has become a breeding ground for the Great White, to exploring ancient wrecks that tell tales of piracy past and present, the team ventures fearlessly into some of the planet's most challenging environments providing a vital and timely understanding of our oceans.