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The team embarks on an expedition to explore the profound effect that man is having on the Mediterranean Sea. Western civilisation developed around its shores, but now human activity is threatening to destroy it.

Expedition leader Paul Rose, environmentalist Philippe Cousteau Jr, maritime archaeologist Dr Lucy Blue and marine biologist and oceanographer Tooni Mahto investigate how the Mediterranean gave rise to one of Europe's first superpowers by diving the remains of a Roman shipwreck. Under the cover of night, they brave the treacherous waters of the Straits of Messina to search for one of the largest predatory sharks in the world - the increasingly threatened, prehistoric sixgill shark.

They dive a perilous network of submerged caves to look for evidence of enormous changes to the Mediterranean Sea and they try to discover whether the feared great white shark could be breeding here.