Lost civilizations, mysterious cities and legendary sites have all vanished. Can draining the seas help unlock what caused their demise?

For centuries treasure ships sailed the world hunted by pirates, battered by storms and reefs. Only now can we begin to explore what remains of them.

Under the seas lives a lost graveyard of sunken war ships. Countless vessels from WWI and WWII pepper the seafloor waiting to be explored.

Towering walls of water, powerful winds and churning seas can overwhelm any ship. But what secrets of the stormy seas can now be revealed?

In warfare, saboteurs are a silent, unseen enemy with advanced weaponry and their element of surprise sending many ships to their final resting place.

War, weather and human error have led to some of the worst maritime disasters history. Drained dry we now reveal the mysteries along America’s shores.

The seafloor is the world’s biggest tsunami machine and its dangers have remained hidden from view, until now!

Beneath the waters of the world, lies undersea empires and relics of their bloody wars. Can today’s technology uncover these lost empires?

An underwater look at the weapon that destroyed one of the Civil War's greatest ships, as well as the torpedo technology that changed military warfare.

Experts explore how the history of America is hidden beneath its harbours, shorelines and street.

The team explores the watery graves of passenger ships and war machines as they investigate what led to such shocking maritime disasters.