Margery Booth, who was an opera singer and later identified as a British spy, performed before Adolf Hitler with secret documents concealed in her underwear.

Booth was chosen to perform at the Berlin Opera House in front of Hitler as part of the dictator's efforts to demonstrate the cultural superiority of the German nation.

After being found out as a spy Booth endured torture by the estapo, but kept silent and ultimately was able to escape to reedom

The heroic activities of Booth who led a double life inside Germany by singing for the Nazi officers while smuggling information to British intelligence has emerged following the discovery of the only known photograph of her.

The photographs have come from a collector and are expected to fetch several hundred pounds when they are offered for sale at auction in Ludlow, Shropshire, on Sept 30.

"It is quite astonishing that the life and heroic activities of this opera singer are not widely known about," the Telegraph quoted Richard Westwood-Brookes, from Mullock's auction house, as saying. (ANI)