Robert Joe (RJ), an urban explorer and historian Dr Sam Willis are on a mission to uncover the secrets behind Heinrich Himmler's Wewelsburg Castle in Germany. On March 31, 1945, Himmler had ordered a member of his staff on a suicide mission to blow the castle up before it fell into American hands as US troops closed in on it, but Himmler's staff was not equipped with enough dynamite to successfully destroy the castle. It survived. When the American troops reached the castle two days later, they found a room with a strange symbol now called the "Black Sun" and a crypt below it with pipes connected to centre of the room believed to be for an eternal...