TV Guide National Geographic Channel Thursday

Experts try to determine how a Varig Flight 254 managed to veer more than 1,000 kilometres off course before crashing in a remote part of the Amazon jungle in September 1989. As they piece together the events, investigators uncover a shocking navigational mistake concerning the last flight of the Boeing 737

Hitler's megalomania led him to construct the ultimate deep-sea destroyer, the largest tank the world has ever seen and a fighter jet that inspired a revolution in aerial warfare.

The Boeing 737 that crash-landed on the M1 in Leicestershire in January 1989, resulting in the deaths of 46 people. The programme examines how investigators discovered a misunderstanding that led the pilots to shut down the only working engine

Tim Shaw and Fuzz Townshend restore an 80s Ford Escort XR3i to surprise a diehard Leeds United fan on his 21st birthday. Along the way, Tim uses science to prove that convertibles offer a more thrilling driving experience than their hardtop counterparts

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

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