Voices from the depths of hell: Photos show messages of love, faith and patriotism carved into walls of vast network of tunnels where men lived and died during WWI

The starkly-beautiful images bring to light the subterranean conditions soldiers of the First World War endured while sheltering from constant artillery fire. Even though the fear of death always hung over the men - or perhaps because of it - the soft stone of the carved-out walls are covered in personal expressions of identity and survival.

Daily Mail | 17 July 2014