TV Guide National Geographic Channel Thursday

Sean Rich, Larry 'Hammer' Harley and Jim Green travel to Colorado for an extravaganza of military collectibles, where Sean examines a 76lb bar of silver that may have come from the most famous Spanish shipwreck rescue in history. Hammer inspects what appears to be an authentic Keris sword with magical properties, while Jim goes to the shooting range with a Civil War re-enactor to see if his 1853 Enfield rifle fires

The China Seas are the site of one of the largest naval battles of all time, not to mention a 700-year-old mystery - and technological wonders, both ancient and modern. This documentary uses state-of-the-art sonar technology combined with the latest CGI to reveal the biggest battleship ever put to sea, a deadly ancient weapon and the underwater threat that could destroy the world wide web in an instant

Uncovering what is left of Hitler's sea-faring structures, which were built in a bid for world domination. The Bismarck and Tirpitz were battleships of record-breaking proportions, and as ultimate status symbols of the Third Reich were relentlessly hunted by the Allies

The 1987 fire at King's Cross tube station, in which 31 people were killed when a match was discarded on a wooden escalator - despite a smoking ban two years previously. Initially small and containable, it became a fatal flashover and ranked as the worst blaze in the history of the London Underground

Tim Shaw and Fuzz Townshend take a trip to northern France to collect 94-year-old wartime hero Roger's 1968 Citroën DS, a car he has owned since it was new. Known as the most beautiful car ever made, the iconic DS was once a real head-turner. However, after decades in a barn, Roger's vehicle is long past its sell-by date. Tim and Fuzz struggle with its radical design features and once again race against time to reveal this very special restored car to its unsuspecting owner

Bidders vie for an 18th-century flintlock, a four-barrel gun so complex and expensive to produce that only the wealthy could afford one, making such items highly desirable. Sean Rich and his fellow Lords also inspect a piece of Second World War memorabilia possibly used by couriers behind enemy lines, which if authentic could be valued at $18,000