Air date: 2016-05-03

Runtime: 45 min

Hitler transformed his Alpine retreat in Bavaria into a fortified fiefdom, home to 2,000 SS troops and protected by a high level security system.

Air date: 2016-05-10

Runtime: 45 min

It’s June 1940 and the Nazis have taken the Channel Islands, where Hitler orders some of the most fortified structures in the Third Reich.

Air date: 2016-05-17

Runtime: 45 min

Ruins across Europe tell the story of Blitzkrieg, a revolution in warfare which almost gave Hitler the chance to create his Thousand Year Reich.

Air date: 2016-05-24

Runtime: 45 min

Hitler planned a submarine to outperform all others. The Type 21 was the world's most advanced submarine: Hitler's sea-faring super weapon.

Air date: 2016-05-31

Runtime: 45 min

In the 1930s the Japanese begin designing the Yamato, the world's most powerful battleship, 30 per cent larger than anything their enemies have.

Air date: 2016-06-07

Runtime: 45 min

In 1945 Japanese generals construct a network of defences and tunnels on Okinawa, creating a devastating killing ground for American troops.