Marc Allum investigates the story of the Carpathia, the ship that went to the rescue of survivors from the Titanic and brings together two of the captain's relatives.
Paul Atterbury investigates the role of the Medway Queen in the Dunkirk evacuation and takes a grandson to visit his grandfather's ship for the first time.
Adam Schoon investigates one of the most remarkable adventures of all time, which was led by one of the biggest names in exploration, Sir Ernest Shackleton.