Related by context. Frequent words. (Click for all words.) 48 tunnels 42 underground tunnels 42 passageways 40 tunnel 37 underground 37 tunneling 34 Tunnels 33 subterranean 33 crawl 33 Tunnel 32 cavern 32 digging 32 trapped underground 32 diggers 31 mine 31 cave 31 miners 31 passageway 31 caves 29 cave ins 29 labored 29 labyrinthine 28 crevices 28 caverns 28 trapped miners 28 mine shafts 28 burrow 28 Channel Tunnel 28 traverse 28 crawling 28 crawled 27 bore 27 veins 27 shaft 27 mine shaft 26 subway 26 flowed 26 scrolled 26 stairwells 26 subways 26 jackhammer 26 Underground 26 dug 26 bowels 26 burrowing 26 slither 25 shafts 25 Digging 25 uncovering 25 bridges 25 trench 25 dig 25 excavate 25 scroll 25 partway 25 slithered 25 beneath 25 trudging 25 maze 24 crawls 24 smuggling tunnels 24 excavating 24 plodded 24 aqueduct 24 crossings 24 staircases 24 archway 23 sift 23 cellars 23 confined spaces 23 trenches 23 toil 23 warren 23 passing 23 trapped 23 carried 23 excavation 23 persevered 23 burrows 23 unearthing 23 coal mine 23 trudge 23 wove 23 ramble 22 burrowed 22 uncover 22 sifting 22 salting 22 grate 22 bridge 22 walkway 22 stuck 22 alleys 22 jogged 22 fortifications 22 bores 22 buried beneath 22 clambering 22 sweated 22 sewers 22 spout