subterranean, aboveground, overground, ventilation shaft, clandestine, opencut, potholing, subbasement, coal mine, dankest, undersea, storage tank, tunnelled, fallout shelter, upflow, subaqueous, samizdat, surficial, pelite, coal seam, dolomitic, geothermic, disused, dank, excavated, billiard parlor, glacial boulder, subway station, subsurface, trenched, unmapped, unmined, radioactive, underwater, metalliferous, opencast, telegraph wire, eluvial, pelitic, atacama desert, snailfish, soakaway, colluvial, turonian, hypogene, americium, reinforced concrete, trafficable, seismologic, elevator shaft, minable, unreclaimed, gneissic, opencast mining, micaceous, unregulated, phreatic, froth flotation, cavelike, electrical, geotechnical, unplumbed, unventilated, lateritic, subglacial, lowermost, hydrothermal, hardrock, punk rock, rubbly, metallurgic, seismographic, cosmogenic, cavernous, kola peninsula, metasomatic, biogeochemical, magmatic, root cellar, detonating fuse, archaelogical, seediest, interurban, carboniferous, geological, trackless, adjoining, embanked, enargite, grimy, lightless, submersed, pegmatitic, argillaceous, foetid, corn borer moth, natural gas, pyroclastic, unaccessible, magnetometric, neocomian, silicic, underworld, sympathies, mafia, propaganda, camp, dissidence, dissidents, ghetto, politic, syndicate, vanguard, club, collaborators, commandos, community, fascists, hostile, intelligentsia, outside, police, subterraneous, auxiliary, communal, potable, regimented, compartmented, landbased, organized, owned, pressurized, segregated, bureaucratized

maquis

., air-raid shelter, al-jihad, alfred damon runyon, aquifer, arachis, arachis hypogaea, bombproof, bomb shelter, booby trap, bulb, bunker buster, burial vault, carlsbad caverns national park, catacomb, cave, cistern, coalfield, corm, crypt, cyclone cellar, damon runyon, divine, divining rod, dowse, dowser, dowsing, dowsing rod, dungeon, dwarf willow, earthquake, egyptian islamic jihad, fairy circle, fairy ring, garden centipede, garden symphilid, gasfield, gasoline pump, gas pump, gbu-28, genus arachis, genus pilosella, genus psilophyton, geophyte, ground-emplaced mine, groundwater level, ground water, guided bomb unit-28, harriet tubman, hawala, islamic jihad, island dispenser, land mine, mammoth cave national park, manhole, maquis, maquisard, mass rapid transit, metro, mushroom, ononis repens, order tuberales, peanut, peanut vine, pilosella, potato, quake, rabbit warren, raf, rapid transit, red army faction, rest-harrow, restharrow, rhabdomancer, rhabdomancy, root, root vegetable, runyon, salix herbacea, scutigerella immaculata, seism, silo, solanum tuberosum, spring water, storm cellar, subway, symphilid, temblor, terrier, tornado cellar, tube, tuber, tuberales, tubman, tunnel, underpass, vanguards of conquest, vault, warren, waterfinder, water finder, water level, water table, water witch, well water, white potato, white potato vine

railroad, railroad line, railway, railway line, railway system, revolutionary group

belowground, clandestine, cloak-and-dagger, covert, guerilla, guerrilla, hole-and-corner, hugger-mugger, hush-hush, irregular, metro, on the quiet, partisan, partizan, resistance, secret, subsurface, subway, surreptitious, tube, undercover