Trap doors under toilets, hidden radio rooms in the back of wardrobes, secret bases behind waterfalls....Dan investigates an extraordinary network of secret resistance cells set up during Britain's "darkest hour".

In the summer of 1940, Britain and its empire stood alone as the Nazi war machine stormed through Europe. Prime Minister Winston Churchill created something extraordinary: secret factions of men and women trained to wreak havoc behind the lines of an invading army.

Dan once again joins forces with Andy Chatterton from the Coleshill Auxiliary Research Team, who are unearthing this incredible part of World War Two for another bunker hunt. What they find on this adventure is truly extraordinary.

You can learn more about Britain's secret resistance in Andy's book 'Fortress Britain 1940: Britain's Unsung and Secret Defences on Land, Sea and in the Air'.

With thanks to Chris Hale, Nina, Will and Martyn from CART, Andy Aust and Duncan Akers.

Produced by Mariana Des Forges and edited by Dougal Patmore.

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