“Many names, nicknames, Masonic logos, city names were etched into the walls. This place was very rich with finds, I didn't even check my watch during almost eight hours underground.

“I left quickly after finding a rusted mortar with mustard gas bottles pieces in it locked on the floor, you really don't want to breath that even after one hundred years,” he told the Daily Mail.

Mr Askat said it was unlikely a museum dedicated to the lost soldiers would be be built as the site would first need to undergo a lengthy and costly de-mining action.