![](https://image.tmdb.org/t/p/w342/yz4r477D8lljEF7xorrv3zvQxls.jpg)
The Enigma Machine, vital to Britain's Second World War effort is re-examined. Mysterious ancient markings on a stone door are discovered.
![](https://image.tmdb.org/t/p/w300/msLPSFpvqZUBfR7iwObFzGFOjDG.jpg)
Other episodes for this season
![The Scarab, The Ark And The Rock](https://image.tmdb.org/t/p/w300/2wLUNtiywMXf6vG6HeN3i5O4odo.jpg)
![Romans, Lost Treasure And A Leech](https://image.tmdb.org/t/p/w300/3Mn5PEaSlUWEQanSW8BoOIT21FW.jpg)
![The Battery, The Screaming Mummy and the Medieval Iron Hand](https://image.tmdb.org/t/p/w300/maFyl5x0ulLXJOG3TclsKRdTuax.jpg)
![The Ancient Computer, The Pigeon and the Roman Nanotechnology](https://image.tmdb.org/t/p/w300/oF5xUESrTl4zRnnq10zRAHENJvu.jpg)
![German Codes, Egyptian Helicopters and the Future Machine](https://image.tmdb.org/t/p/w300/8C0YudGxl2GwVqU4y57FMNeszHe.jpg)
![The Viking Coin, the Ancient Disk and the Dead Girl that Saved Millions](https://image.tmdb.org/t/p/w300/msL6WCnzWLufv062JKxaUIeCqxc.jpg)
![The Golden Disk, The Book of Mysteries and the Mirror to the Other Side](https://image.tmdb.org/t/p/w300/jN6VNa13bNWcwsyWSoRdYvfuJbX.jpg)
![The Gold Hat, The Nazi Cube and the Billion Pound Clock](https://image.tmdb.org/t/p/w300/wjxooJfd349ymMX1egxtVNHBtXM.jpg)
![The Fake, The Spy and the Steam Powered Brain](https://image.tmdb.org/t/p/w300/msLPSFpvqZUBfR7iwObFzGFOjDG.jpg)
![The Ice Age Shaman, The Bronze Age Sky And The Steampunk Lightbulb](https://image.tmdb.org/t/p/w300/msLPSFpvqZUBfR7iwObFzGFOjDG.jpg)
The Enigma Machine, vital to Britain's Second World War effort is re-examined. Mysterious ancient markings on a stone door are discovered.