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mole run

British  

noun

  1. informal  (usually plural) any part of a system of underground tunnels, rooms, etc, prepared for use in the event of nuclear war

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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She began by cutting a cube of turf from the roof of the mole run and carefully set it on the ground.

From The Guardian