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.
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.
Source: Wikipedia "Chełm Chalk Tunnels" · CC BY-SA 4.0
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