hole, burrow, underground passage, subway, tube, crawl space, crawlway, shaft, mine, pit, crosscut, drift, adit.
"tunnel." YourDictionary, n.d. Web. 20 June 2019. <https://thesaurus.yourdictionary.com/Tunnel>.
tunnel. (n.d.). Retrieved June 20th, 2019, from https://thesaurus.yourdictionary.com/Tunnel
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