Classes

burial cave - chandrashala - cellarium - cave with prehistoric art - cave system - caves not open to the public - cavern - casemate - burial vault - cluzeaux - burdei - buffalo jump - beer cellar - basement - barma - artificial cave - aljibe - zinc mine - dugout - grotto - glacier cave - ghost station - gama - favissa - erdstall tunnel - Echika - dungeon - wine room - dripstone cave - diatreme - deep single-vault station - deep geological repository - deep column station - crawl space - coastal cave - toll tunnel - underground buildings - underground bicycle parking - tunnel washer - tunnel of aggression - tunnel network - trum - traveling shaft - tramway tunnel - underground irrigation canal - tin mine - tik-kuyu - test gallery - surface shaft - surface mine - supply tunnel - subway tunnel - urban tunnel - water tunnel - watering hole - water drainage gallery - watercourse tunnels - viaje de agua - vertex tunnel - ventilation adit - utility tunnel - grotto - uranium mine - underwater tunnel - undersea tunnel - underground structure - underground parking facility - underground mine - underground limestone mine - subterranea - underground railway station - underground lake - underground home - underground city - underground base - undercroft - torricellian chamber - sump - underground station - subterranean waterfall - subterranean river - subbasement - storm cellar - sommerkeller - solutional cave - sod house - shell grotto - railway station underpass - Colleiteiro - Bourges casemate - shallow single-vault station - Zindan - gua lawa - Sacred Heart cave - underground metro station - pedestrian underpass - shallow column station - zemlyanka - yagura - wine cave - wind cave - volcanic pipe - ventilation level - underground storage - lava cave - pit-house - pit cave - mortuary cave - missile launch facility - marine cave - lunar lava tube - level - lava tube - Prince Charlies cave - intake level - infernotto - ice cave - ice cave - hypogeum - houle - gypsum cave - rock-cut architecture in India - sepulchral chapel - sea cave - salt cavern - salt cave - rock temple - rock shelter - rock-cut tomb - rock-cut architecture - submerged floating tunnel - rock cellar - rock cellar house - roadway floor - return air level - replica of a cave - ratskeller - pylon station - driveway - glacier tunnel - geothermal well - gate gallery - freight tunnel - fogou - flint mine - escalator tunnel - engine-shaft - gold mine - drive-through tree - drainage tunnel - double shaft mine - dive-under - district heating tunnel - diamond mine - denehole - deep underground mine - high-speed railway tunnel - iron mine - inverted siphon - international tunnel - inactive mine - immersed tube - hydro mine - hood tunnel - historical mines in Sauerland - deep borehole disposal - helical tunnel - haul road - hauling shaft - gypsum quarry - group of tunnels - gravel pit - granite mine - base tunnel - bridge–tunnel - breport - borehole - bootleg mining - blind shaft - blast-hole - bell pit - bauxite mine - buried watercourse - barite mine - approach adit - ancient stone quarry - adventure mine - adit - adit - adega - cayat - cycling tunnel - cut and cover tunnel - combination tunnel - cobalt mine - clay pit - chultun - chromium mine - chalk quarry - kariz - cavern - catacombs - car tunnel - canal tunnel - cable tunnel - bus tunnel - burraia - refilling of shafts - sand and gravel plant - salt mine - roundabout tunnel - root cellar - Roman tunnel - rock engineering - road - rescue tunnel - sand mine - rare earth mine - quarry lake - prosek - proposed tunnel - prehistoric mining - potash mine - postal railway tunnel - slate quarry - stone quarry - spiral tunnel - souterrain - sough - solfara - smuggling tunnel - small-scale coal mine - slope mining - placer mine - slate mine - ski tunnel - silver mine - shurf - show mine - secret passage - schotterwerk - longwall - military tunnel - mercury mine - matamorra - marl pit - manriding shaft - manganese mine - main drift - main adit level - mine opening - lithium mine - limestone quarry - lignite mine - leat - learning mine - lateral drift - kopi - ore mine - pit water - pit quarry - pilot shaft - penstock - pedestrian tunnel - panning area - outfall sewer - ort - active wine cellar - open-pit lignite mine - opencast mine - oil mine - nickel mine - natural stone quarry - mining park - mine shaft