The northern seas of Europe for thousands of years provided a fearsome challenge for those who live on its shores. Hardened and toughened by the harsh conditions, one group became pre-eminent, the much feared Vikings. With their skill in boat building and seamanship, they spread across much of Europe and even as far as the Americas.

Through the unique visualisation techniques developed for Drain the Oceans, the Vikings can now be brought back to life. And it wasn't just the Vikings, their legacy came down through generations of seafaring Scandanavians as the numerous shipwrecks lying on the floor of the Baltic Sea can testify.

Perhaps the most spectacular of those is the battleship Mars, which vanished over 450 years ago on just the second day of her career at sea. Shrouded in legend, this ship has recently been discovered off the coast of Sweden and is proving that she more than lives up to the many myths that surround her.