Armed with liquid metal reactors and titanium hulls, these submarines weren’t just advanced—they were terrifying. Built in secrecy and pushed to extremes, they changed naval warfare forever.

September 1943. Hidden in Norway’s Altenfjord, the battleship Tirpitz—sister to Bismarck—threatens Allied sea lanes. Enter Operation Source: a high-risk plan to tow six Royal Navy X-craft mini-subs ...

German divers searching the Baltic Sea for discarded fishing nets have stumbled upon a rare Enigma cipher machine used by the Nazi military during World War Two which they believe was thrown overboard ...