The height of Roman power. The greatest army the world has ever known – or, at least, that it remembers. Far down in the depths of the ocean, the remains of another power still survive, desperately eking out an existence. History has many secrets, and none more so than the mission of a certain Roman fleet, long lost in the murk of time.

A medieval girl stands at the edge of a clifftop. Behind her, a gaunt castle, the Lord who has claimed her for his wife, and the cruel execution of her lover. Before her, cold dark waves. She leaps. As she falls through the waters, her long dress blooms out around her. She lets out her last breath. Even as her vision blurs, she catches a glimpse of his face…

The Spanish Armada. Galleons sway on roiling seas as far as the eye can see. In a smoky cabin, a young boy works to keep the cannons loaded. A chance explosion hurls him into the waters. Beneath the waves, ships and men sinking gracefully down to their graveyard at the bottom of the sea. Forever lost to the world above, a bounty to those who wait below…

World War II. British Spitfires and German Messerschmitts swarm in a furious dogfight.. A Spitfire is hit. The plane plummets helplessly into the water, gliding down through the sea. As his cabin fills with water, the desperate pilot tries to escape…

Azure skies, sun drenched waves and coral reefs bursting full of life. Diving in the Mediterranean seemed the perfect setting for a honeymoon. Swimming down into an inviting looking cave, a young couple discover more than they planned on…