An abandoned underground hospital from World War One, located in a limestone quarry in Northern France, has been discovered by a photographer and urban explorer named Marc Askat. The hospital, known as 'Carriere Suzanne,' was used to save wounded soldiers during the war and still contains some of its original stretchers, graffiti, and carvings made by wounded soldiers. The exact location of the hospital is being kept secret until it can be made safe for the public to visit. Askat believes that sites like these are crucial in preserving our history.