Related by context. Frequent words. (Click for all words.) 46 depressurized 45 airlock 41 subsurface 41 wellbore 41 magma 41 geological 40 geophysicist 39 methane concentrations 39 British Antarctic Survey 39 cavern 39 subsidence 39 coffer dam 39 dewatered 39 waterproofed 39 methane 39 geologic 39 properly ventilated 39 seismicity 39 geology 38 magmatic 38 methane hydrates 38 caulked 38 plate tectonics 38 seismic activity 38 melting permafrost 37 hydrology 37 earth crust 37 marine sediments 37 permafrost 37 habitable 37 Geophysicist 37 interglacial 36 volcanism 36 tectonics 36 hydrological cycle 36 astrobiologist 36 refilled 36 geologic formations 36 reservoir characterization 36 ventilation shafts 35 Geochemistry 35 rockfall 35 geoscientist 35 geochemist 35 geologist 35 crustal 35 coolant 35 Earth crust 35 geomorphology 35 sprang leak 34 furnace filter 34 polar caps 34 disassembled 34 methane hydrate 34 Martian landscape 34 seabed 34 geological formations 34 reservoir 34 refreeze 34 backfilled 34 geological geophysical 34 pumphouse 34 seismologist 33 underground caverns 33 underground 33 coal seam 33 hydrogeology 33 subduction 33 capping stack 33 repaired 33 seismological 33 dewatering 33 Martian surface 33 winterized 33 mine shaft 33 USGS 33 volcanic activity 33 atmospheric chemistry 33 longwall 33 plugged 32 Antarctic Ice 32 terrestrial planets 32 oceanographer 32 Antarctic ice 32 shaft 32 Caverns 32 containment vessel 32 sprung leak 32 Martian 32 planetary scientist 32 CO2 concentrations 32 cofferdam 32 subterranean 32 seepage 32 rendered inoperable 32 GNS Science 32 Hydrologist 32 sedimentation 32 earth tremors 32 glaciers 32 sedimentary rock