Ross undergoes expert training with Scuba Diver Neil Brock. But will his efforts be worth it when he visits Scapa Flow, the resting place of one of World War II's biggest naval disasters. Ross Kemp dives on a series of incredible shipwrecks around the British coastline to reveal some of the nation’s murkiest and best-kept secrets. From the remains of a slave ship discovered off Plymouth, to the Kaiser’s sunken Imperial Fleet in Scapa Flow and an experimental submarine aircraft carrier, which sank with all passengers and crew on deck during its sea trials, Ross uncovers Britain’s hidden maritime past.