Twenty-one German soldiers entombed in a perfectly preserved World War One   shelter have been discovered 94 years after they were killed. The men were   part of a larger group of 34 who were buried alive when a huge Allied shell   exploded above the tunnel, near the small town of Carspach in the Alsace   region in France, in 1918 causing it to cave in.

Picture: pair archeologie/BNPS.co.uk