Inspired by the story of his two cousins that died at sea in WWII, Ross Kemp explores captured German scout warship, the F2 and brings up treasure that could link back to his relatives.

Ross Kemp continues his adventure in Scapa Flow, plunging down on the wrecks of a German warship and an experimental submersible aircraft carrier called the M2.

On the coast of north Devon, Ross is joined by Emily Turton, as he prepares to dive down on the wreck of sunken steam ship Iona II. The ship was heading to America in the early 1860s, when it went down with a mystery cargo on board that the owners went to extensive efforts to recover in secret. Ross hopes his night dive might reveal what they wanted back so badly but the wreck is shrouded in dense low visibility which hampers their investigations.

Ross and Mallory dive down to the wreck site of 36-gun Nelsonian frigate HMS Amethyst, a legendary battle cruiser, launched in 1799, which proved one of the most successful and prolific of the Napoleonic wars. Ross makes an incredible find using an underwater metal detector, and the historic item reveals why the ship was such a potent weapon of war but also gives clues as to how and why it sank. It leads Ross, Mallory, and Neil to the 16th century Minera Tavern for a story of trickery and kidnapping by the Royal Navy.

In preparation for his deepest ever dive, Ross returns to training with dive master Neil Brock and explores the site of Britain’s most famous wreck: the Mary Rose.

Ross hops from Portsmouth to Plymouth and explores a coastline littered with treasures. A bout of hypercapnia leaves Ross shaken after the dive of a 17th century shipwreck.

The quest continues in the Red Sea off the coast of Egypt, a deeply personal journey given Ross' grandfather fought in the North African campaign during World War II.

Starting in Dorset's Studland Bay, Ross searches for wrecks that tell the story of D-Day and learns that winning wasn't just a case of superior power, but also ingenuity.