Chełm Chalk Tunnels
From Wikipedia, the free encyclopedia
The Chełm Chalk Tunnels (in Polish Chełmskie podziemia kredowe) are a system of tunnels dug into the chalk under the city of Chełm in eastern Poland. The tunnelling began in the Middle Ages for chalk mining and was discontinued in the 19th century.[1] The tunnels also served Chełm's inhabitants as shelters during raids, wars and pillage.[1] The system is now open solely for tourists. In total, the network of tunnels stretches for around 15 kilometres (9 miles).