Related by context. Frequent words. (Click for all words.) 62 mine shafts 54 caverns 50 mineshaft 50 underground caverns 50 mine shaft 49 elevator shafts 49 caves 48 tunnels 48 ventilation shafts 48 streambeds 48 mines 47 shafts 47 quarries 47 cavern 47 subterranean 47 waterholes 47 churchyards 47 quarry 47 gullies 46 crevasses 46 underground 46 unmaintained 46 dense undergrowth 45 crevices 45 burrows 45 muskeg 45 adits 45 riverbed 45 drainpipes 45 trapdoors 45 depths 44 stone quarries 44 tailing ponds 44 garbage heaps 44 cave 44 ledges 43 cliffs 43 manholes 43 coalmines 43 underground cavern 43 opencast 43 riverbeds 43 Martian landscape 43 collieries 43 underground tunnels 43 stairwells 43 barrens 43 mountainsides 43 underwater caves 43 trackless 43 subway tunnels 43 stairways 42 disused 42 #ft #m [002] 42 seabeds 42 #m #ft [002] 42 footpaths 42 stormwater drain 42 passageways 42 sumps 42 bridge abutments 42 sinkholes 42 stope 42 trench 42 chimneys 42 trenches dug 42 boreholes 42 caissons 42 sheer cliffs 42 granite boulders 42 shaft 42 creek bed 42 riverbanks 42 dry riverbed 42 reed beds 42 roadbeds 41 burrow 41 tunnels dug 41 colliery 41 mine tailings 41 crawl spaces 41 ditches 41 depressions 41 brickworks 41 drainpipe 41 rocky outcrops 41 staircases 41 window ledges 41 mud puddles 41 diggers 41 footways 41 traps 41 rock outcrop 41 beneath 41 rubbish dumps 41 stopes 41 chutes 41 hillocks 41 overhanging trees 41 basements 41 sandpit