There may be as many as one hundred thousand vessels lying on the floor of the Baltic sea, but perhaps the most spectacular of those is the battleship the Mars, which vanished over 450 years ago on just the second day of her career at sea. Shrouded in legend, this ship proves that she more than lives up to the many myths that surround her.

In the summer of 1940, Adolf Hitlers Nazis conquered France; just 20 miles of sea separated his army and his next target, Great Britain. Now we can uncover the wrecks of planes and ships that reveal the truth of how Britain stood firm against the Nazi raiders and defeated Hitler in the battle of Britain.