Related by context. Frequent words. (Click for all words.) 39 adits 39 tailings dam 38 induced polarization IP 38 trenchless 37 tunnels dug 37 underground 36 underground cavern 36 stopes 35 underground workings 35 Tunneling 35 coal seam 35 underground tunnels 35 dewater 35 coal seams 34 tunneling 34 injection wells 34 tunnels 33 adit 33 heap leach pad 33 excavation 32 borehole 32 undersea 32 dewatering 31 Storage Tank 31 stope 31 coalmine 31 vertical shaft 30 mine 30 mines 30 excavating 30 mining 30 elevator shafts 30 mine shafts 30 excavated 30 Tunnel 29 coalmines 29 underground caverns 29 coal mine 29 subterranean 29 ventilation shafts 29 shaft 28 digging tunnels 28 tunnel 28 underground bunkers 28 mined 27 tunnelled 27 Underground 27 subway tunnels 27 excavate 27 geologic formations 27 shafts 27 cavern 27 mineshaft 27 mine shaft 27 passageways 26 trapped underground 26 Tunnels 26 methane gas 26 trench 26 digging 26 aboveground 25 disused 25 subway 25 ventilation shaft 25 caves 24 underground bunker 24 Subterranean 24 catacomb 23 Chilean miner 23 electrical substation 23 underground piping 23 dungeon 23 caverns 23 breathable air 22 underground aquifer 21 pipe 21 ventilation ducts 21 piping 21 Cavern 21 miners 21 catacombs 21 trapped miners 20 cave 20 penstock 20 manholes 19 Chilean miners trapped 19 trapped Chilean miners 19 cellars 19 manhole 18 overground 18 Manhole 16 beneath 15 bowels 15 murky depths 14 basement 14 basements 13 clandestine 13 dank 12 samizdat 11 dark dank 10 underworld