Disc.Sci+1 World's Longest Railway Tunnel. Richard ventures 2km beneath the Alps into the world's longest underground railway connection, the Brenner Base Tunnel, riding some giant machines! S1, Ep5 2026-05-29 Super Stadium. Richard explores the huge Tottenham Hotspur Football Stadium in London. He explores a pitch that splits and rolls away and takes a terrifying walk on the stadium roof! S1, Ep6 2026-05-29 California's Hidden Doomsday. Rob heads to California to investigate a network for major fault lines that could set off a mega-quake. Plus, he explores a mysterious sinkhole. S1, Ep6 2026-05-29 Secret History of the New World. Rob Nelson investigates a cluster of ancient ruins in New England that suggest Europeans arrived in the Americas almost 1,000 years before Columbus. S1, Ep7 2026-05-29 The Dark Matter Enigma. Dark matter is one of the greatest mysteries of the universe facing scientists today. Could it be the cause of supermassive black holes and mass extinctions? S5, Ep7 2026-05-29 Strangest Alien Worlds. Astronomers have discovered bizarre planets very different to Earth out in the galaxy, but will we ever locate a planet similar to our own? S5, Ep8 2026-05-30