X1 The Royal Navy's Mystery Submarine

Originally designed in 1934 for anti-submarine training, by the end of the war 72 U-Class subs had been commissioned; 17 were lost to the enemy, and 3 in accidents. Manned by crews from seven nations' navies, they served worldwide, and never more successfully than in the Mediterranean.

During the bleak, heartbreaking days of early 1942, when beleaguered Malta was reeling under bombardment and blockade and Rommel was making his last desperate thrust towards Egypt, only one British submarine was operating in the western Mediterranean - the tiny, 600-ton Unbroken.

The Sky at Night in the Multiverse of Mystery is a magical journey into the far-flung ideas at the very edge of scientific knowledge, exploring the concepts that today seem like science fiction but may one day become science fact. Delving into the archive at the Royal Society, we look at the dreamers who first considered the possibility of travelling to the moon and black holes long before they could be proven to exist. From there, the team explore some ideas and theories that today could be dismissed as fanciful thinking.

From the New York Times bestselling author of Washington's Spies, "a page-turning thriller" (James M. Scott) about ​one of the greatest heists in history: the U.S. Navy’s clandestine capture of a Nazi U-boat at the climax of World War II.