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(Click for frequent words.) 73 underground tunnels 71 tunnel 65 tunnels dug 65 Tunnels 60 subterranean tunnels 59 passageways 59 underground passageways 59 bridges viaducts 57 ventilation shafts 57 pedestrian passageway 56 underground 56 Tunnel 54 tunnelers 54 pedestrian underpasses 53 viaducts 53 tunneling 52 smuggler tunnels 52 smuggling tunnels 52 subterranean 52 caves 52 rat infested subway 52 sarcophaguses 51 PATH tunnels 51 arms smuggling tunnels 50 limestone caverns 50 unheated greenhouses 50 TBMs 50 tunnels burrowed 50 Sandhogs 50 Loetschberg 49 Marmaray tunnel 49 subway tunnels 49 Staircases 49 vertical shafts 49 underpasses 49 Vinh Moc 49 weapons smuggling tunnels 49 tunnellers 49 wildlife underpasses 49 digging tunnels 48 mineshafts 48 elevator shafts 48 Pena jogged 48 underground passageway 48 mine shafts 48 subterranean labyrinth 48 sandhogs 47 caverns 47 crossings 47 Poisonous gases 47 underpass 47 ventilation ducting 47 passageway 47 secret passageways 47 casemates 47 Transbay Tube 46 trench 46 Bronx Whitestone 46 elevated viaduct 46 Hamas smuggles 46 Solomon Stables 46 La Paila zone 46 encrypted VPN 46 earth bunds 46 stoppings 46 roadbed 46 corn borer moth 46 bridges 46 flyover ramps 46 winding alleys 46 viaduct 46 overpasses underpasses 45 overbridges 45 cavern 45 IPsec VPN tunnels 45 salt dome caverns 45 Lowari Top 45 heavily fortified bunkers 45 tunnelled 45 aqueducts 45 shafts 45 Manholes 45 Lötschberg 45 Salang Tunnel 44 railroad trestles 44 subterranean passages 44 manholes 44 railway trestle 44 Philadelphi Route 44 underground bunkers 44 Tunneling 44 tunneled 44 roadheader 44 cofferdams 44 transbay tube 44 Lowari 44 Mykola Lebed led 44 trackbed 44 Rafiach 44 Sufa border 44 flyovers underpasses 44 Queens Midtown Tunnel 43 hidden passageways 43 Zojila Pass 43 Whitehurst Freeway 43 mud fortresses 43 bridge abutments 43 Bunker Hill Bridge 43 ventilator shafts 43 Karni checkpoint 43 crystal chandeliers silk 43 Conrail railroad 43 aqueduct 43 attics cellars 43 operator Connector Motorways 43 interconnecting tunnels 43 squirrel burrows 43 overhanging cliffs 43 Liberty Tunnels 43 Verrazano Narrows 43 elevated expressways 43 stairwells 43 Salang tunnel 43 smuggling tunnels snaking 43 crawlspaces 43 caissons 43 escapeways 43 Engineer Husnu Unal 43 Kerem Shalom Crossing 43 Paved roads 43 underground cavern 43 catenary wires 43 underground caverns 43 fortifications 43 underground parking garages 43 wooden trestles 43 funiculars 43 bunkers 43 earthen embankments 43 electrical conduits 42 Karni cargo crossing 42 slit trenches 42 Fiber optic cables 42 staircases 42 overhead catenary 42 caves sinkholes 42 narrow passageways 42 miners entombed 42 Bloor Danforth 42 Gihon Spring 42 Bolu Mountain 42 Cu Chi tunnels 42 Philadelphi Corridor 42 walkways 42 causeways 42 burrows 42 Erez terminal 42 limestone cavern 42 alleys 42 elevated guideway 42 footbridges 42 Underpasses 42 adits 42 Doug Hanchett 42 switchyards 42 Tunnelling 42 Dulles Metrorail 42 catacombs 42 pedways 42 spokeswoman Jawauna Greene 42 throughways 42 rodent burrows 42 Unguarded border 42 overpasses 42 Philadelphi route 42 subways elevators 42 Abu Houli 42 injecting grout 42 sewer pipes 42 canals 42 correspondent Jane Arraf 42 earthen fortifications 42 emperor tomb 42 bridges underpasses 42 airshaft 41 corridors 41 undergound 41 belowground 41 Inner Northern Busway 41 ziplines 41 Tacony Palmyra 41 sewers 41 underground aqueducts 41 limestone caves 41 Money petrifies 41 Marmaray project 41 Giza plateau 41 stone staircases 41 tramway 41 Thames Tideway 41 shaft 41 Storing carbon dioxide 41 pneumatic drills 41 handicapped accessible ramps 41 ventilation shaft 41 Roman aqueduct 41 underground vaults 41 subterranean caverns 41 headhouse 41 subterranean caves 41 Severn Tunnel 41 subway grates 41 dams canals 41 Queensway Tunnel 41 overland 41 Katyusha rocket launchers 41 Pedestrian walkways 41 blockhouses 41 Rotherhithe Tunnel 41 Kassam launchers 41 M4 M5 41 Brooklyn Battery Tunnel 41 rail sidings 41 Clem7 tunnel 41 trestles 41 rotting timbers 41 Monitor Merrimac 41 jungle canopy 41 Controlled explosions 41 Abu Majad 41 Retaining walls 41 Tuojiang River 41 postholes 41 overhead catenary wires 41 Thu Thiem tunnel 41 Coherex FlatStent EF 41 Chunnel 41 overground trains 41 micro tunneling 41 TransApex 41 razor wire fencing 41 cicada nymphs 41 landscaped berms 41 reinforced concrete 40 steel arch truss 40 steel girders 40 LIRR trains 40 manhole 40 Drainage ditches 40 aboveground 40 sewer manholes 40 Worshiping Women 40 stalagmites stalactites 40 steep sandstone cliffs 40 paste backfill plant 40 Barapullah Nallah 40 Karni crossings 40 epoxy bolts 40 mountainous Benguet province 40 dirt berms 40 sewage pipes 40 wooden walkways 40 mine shaft 40 throughway 40 lattice towers 40 train trestles 40 Décarie Expressway 40 guideway 40 Sumner Tunnel 40 Souvenir hunters 40 multilane highway 40 railway viaduct 40 fences razor wire 40 walkway 40 MPLS TE 40 tramways 40 Naung Laing 40 cableways 40 bridge girders 40 brick arches 40 subway 40 gatehouses 40 A2 motorway 40 mazes 40 Overpasses 40 Sonneman Level 40 Manhole covers 40 Keren Shalom 40 Turkoglu trudged 40 launching Qassam rockets 40 Karem Shalom 40 Inland Feeder 40 Philadelphi corridor 40 Sajaiya neighborhood 40 Jamestown Verrazzano Bridge 40 Franz Josef glacier 40 blockaded enclave 40 pipes 40 Alps Leuenberger 40 Smuggling tunnels 40 Karni terminal 40 Gotthard massif 40 moat drawbridge 40 IPSEC VPN 40 Transit commuter trains 40 mainline railway 40 Marmaray 40 Landslides blocked 40 firing Kassam rockets 40 Flyovers 40 earthen berms 40 earthen dikes struggling 40 cloverleafs 40 railroad overpasses 40 enclosed walkway 40 steel superstructure 40 rainwater drainage 40 Golmud Lhasa section 40 guideways 39 cellars 39 Underground 39 poison gasses 39 sewerage pipes 39 pedestrian walkway 39 Patna Howrah 39 carriages 39 tentlike structures 39 Toowoomba Range 39 Sufa crossing 39 millrace 39 gulleys 39 Cuetzalan 39 elevated guideways 39 train carriages 39 ventilation ducts 39 Bailong river 39 acquifers 39 Queens Expressway 39 pedway 39 untolled 39 irrigation canals 39 avalanche chutes 39 disused railway 39 bomb craters 39 deathtraps 39 gulches 39 Breachers 39 railroad viaduct 39 drainage pipes 39 Philadelphi 39 alleyways 39 hidden compartments 39 skybridges 39 Harbor Tunnel 39 Genwal Mine 39 onramps 39 sliproads 39 PATH trains 39 MAGLEV 39 Qassam rocket launchers 39 snowshed 39 Stag Leap Winery 39 earthen mounds 39 midblock 39 mineshaft 39 excavations 39 subways 39 gangways 39 air conditioning ducts 39 crawl spaces 39 Wabash Tunnel 39 stalactites 39 caprock 39 called mantrips 39 Armored bulldozers 39 Karni cargo 39 sanitary sewer mains 39 circular particle accelerator 39 mudbrick buildings 39 resignalling 39 Faleme River 39 As nymphs burrowing 39 Channel Tunnel 39 Moraca River 39 Thames Tunnel 39 manhole lids 39 dedicated busways 39 treetop canopy 39 gypsum mines 39 tall flightless bird 39 busway lanes 39 hilltop fortress 39 conical dome 39 antechambers 39 tunnels Baywong 39 ratlines 39 warren 39 Mosholu Golf Course 39 Rohtang pass 39 gasometers 39 Monitor Merrimac Bridge 39 subsidences 39 highways 39 Sutong Bridge 39 smelting furnaces 39 emplacements 39 walls razor wire 39 busways 39 underground coal seams 39 Maroun el Ras 39 expose coal seams 39 Hoosac Tunnel 39 metalled road 39 steel girder bridge 39 amphibious armored vehicles 39 crevices 39 electrified rails 39 #feet [001] 39 drawbridges 39 Bloor Danforth line 39 rockface 39 Aswan dam 39 spiral staircases 39 Sitra Causeway 39 Montara Mountain 39 leaky feeder 39 Edgware Rd 39 Nachal Oz 39 Sutro Baths 39 related amyloidosis carpal 39 truss bridge 39 mag lev 39 Wittpenn Bridge 39 RAFAH GAZA STRIP 39 Karakoram highway 39 rigs peeked 39 burrow 39 Triboro Bridge 39 razor wire fences 39 beltways 38 underpass beneath 38 labyrinthine alleyways 38 Katyusha launchers 38 multilane highways 38 Bedouin trackers 38 stairways 38 steep staircases 38 earthen barriers 38 Montclair Boonton 38 rockwork 38 Gowanus Expressway 38 Trucks rumble 38 parking garages 38 coffer dams 38 Adige river 38 stringing barbed wire 38 avenge Rantisi 38 arterial roadways 38 Leh Manali road 38 Concrete barriers 38 Battery Tunnel 38 Osirak nuclear reactor 38 runnels 38 Saqqara pyramids 38 timber pilings 38 cave 38 Merkava tank 38 King Tutankhamen tomb 38 subsea cables 38 elevators 38 Patroon Island 38 Mugrabi Gate 38 Zojilla 38 buses streetcars 38 con crete 38 shallow tubewells 38 skywalks 38 archway 38 concrete piers 38 automatic rifles grenades 38 Bakerloo Central 38 Smuggler Gulch 38 stone cairns 38 NEAT Gotthard Base 38 spiral stairway 38 flammable solvents inside 38 piezometers 38 trackway 38 jackhammers 38 Tuo River 38 Midtown Tunnel 38 trenchless 38 Concertina wire 38 bailey bridge 38 BART Transbay Tube 38 wormholes 38 stalactites stalagmites 38 drainpipes 38 freeway ramps 38 overground rail 38 trains 38 excavation 38 pedestrian walkways 38 Siloam Pool 38 Large Ion Collider 38 Leaking pipes 38 pore spaces 38 Vincent Polimeni 38 buidings 38 corrugated metal pipe 38 Central Artery 38 Khunjerab Pass 38 Aswan Dam 38 wall Asato 38 Tip O'Neill Tunnel 38 Covered walkways 38 Surda checkpoint 38 sphinx statues 38 Leverett Circle 38 entrances 38 Qiongzhou Straits 38 Bayon temple 38 wooden timbers 38 Deep Tunnel 38 rainwater seeps 38 Leverett Connector 38 similar tiebacks 38 bascule span 38 creek crossings 38 Hood Canal floating 38 Big Dig tunnels 38 concrete bollards 38 wire mesh fencing 38 fibreoptic cables 38 retaining walls 38 airtight chambers 38 manway 38 limestone outcrop 38 highwalls 38 enemy emplacements 38 bridges tunnels 38 coastbound 38 Baghran valley 38 Lincoln Tunnel 38 culverts 38 confined spaces 38 motorable road 38 interchange ramps 38 Tunnel Boring Machine 38 skyscrapers 38 archaeologist Eilat Mazar 38 freeway onramps 38 underbridges 38 CADE Winery 38 Paris Métro 38 ramshackle dwellings 38 stairwells elevators 38 meter Piz Vatgira 38 lava tubes 38 desalinization plants 38 malarial swamp 38 treeless hills south 38 Allston Brighton tolls 38 spokesman Avner Ovadiah 38 Capt. Jacob Dallal 38 Holland Tunnel 38 pedestrian walkway connecting 38 King Fahd Causeway 38 airtight refuge 38 aerial tram 38 Verrazano Narrows Bridge 38 Tijuana Arellano Felix 38 limestone quarries 38 mines 38 cisterns 38 Rockslides 38 toppled palm trees 38 sewerlines 38 roads 38 hollow tubes 38 railroad underpass 38 canal 38 Kerem Shalom crossings 38 Melbourne CityLink 38 Kaiolu Street 38 overpass 38 trench collapses 38 Srinagar Leh highway 38 snow forts 38 rocky crevices 38 cracks crevices 38 armored vehicles trundled 38 corridor 38 wooden sleepers 38 shallow depressions 38 Guatemala sinkhole 38 slab formwork 38 Ville Marie Expressway 38 wagon ruts 38 waterpipes 37 IDF sappers 37 potholing 37 oxyacetylene torches 37 underground workings 37 Huayuan mine 37 Bloodied bodies 37 slag heaps 37 rock groynes 37 Moffat Tunnel 37 Machu Picchu citadel 37 high voltage powerlines 37 overhead gantry 37 concrete slabs 37 railbed 37 pedestrian skyway 37 mousehole 37 granite bedrock 37 tombs 37 sally ports 37 interceptor sewers 37 overland routes 37 courtyards 37 Stormwater drains 37 Adi Ghar mountain 37 Mont Blanc Tunnel 37 landscaped walkways 37 Hesco barriers 37 #kV transmission lines 37 MetroLink trains 37 Tatyana Muscovite 37 cenotes 37 Qalandiyah 37 Leonard P. Zakim 37 Alum Pot 37 dug narrow passageway 37 cave ins 37 erecting scaffolding 37 CAIRO Archaeologists 37 Liard Highway 37 Walkways 37 Pigeon guano 37 vein outcrops 37 ventilation duct 37 Northern Busway 37 Central Artery Tunnel 37 pyramids 37 stalagmites 37 roadbeds 37 Raj Varatharaj 37 kilovolt transmission line 37 Gotthard Base Tunnel 37 Baakens River 37 underground lair 37 Cement mixers 37 tramcars 37 spokeswoman Lena Zimmerschied 37 Ramat Rahel 37 Ms. Dussinger 37 hole stoping 37 prehistoric Qesem cave 37 firefighter Rony Veliz 37 ducts 37 operator Groupe Eurotunnel 37 Lyulin motorway 37 embankments 37 Bloor Danforth subway 37 dig trenches 37 AeroTrain 37 pipelines 37 twisting alleys 37 InterCity trains 37 Mullum Mullum 37 overhead wires 37 Krzowski 37 Addison Vt. 37 Triborough Bridge 37 dusty rutted 37 Mount Gilboa 37 penetrating radars 37 Keystone Corridor 37 waterproof membranes 37 FLEXITY Swift 37 PATH commuter train 37 Yonathan Mizrachi 37 Scarborough Rapid Transit 37 M7 Westlink 37 freeway overpasses 37 Siq 37 reversible lanes 37 Montclair Boonton Line 37 drainage pipe 37 Buses trams 37 dungeons 37 steel sheeting 37 sprawling Al Qaqaa 37 Thu Thiem Tunnel 37 riverbed 37 Kincardine Bridge 37 blowtorches 37 Priest Grotto 37 PATH commuter rail 37 Gatun Locks 37 unguided missiles 37 Harold Interlocking 37 Ophel 37 retaliatory kidnappings 37 Kallang Paya Lebar Expressway 37 Netzarim settlement 37 walled enclosure 37 acetylene torches 37 diversion weir 37 sandhog 37 soundwalls 37 lava tube 37 burrowers 37 stormwater inlets 37 Hood Canal bridge 37 mountainside tunnels 37 Secaucus Transfer 37 steel latticework 37 manure pits 37 Bar Lev Line 37 wadis 37 crevasses 37 tram 37 Gyeongui Line 37 earthen mound 37 Manawatu Gorge 37 archways 37 Alpazat caverns 37 stopbanks 37 gabion baskets 37 sidings 37 HOV HOT lanes 37 maze 37 concrete abutments 37 dank interiors 37 railroad underpasses 37 Islais Creek 37 pedestrian promenade 37 bridges overpasses 37 Ayalon Freeway 37 mazelike 37 ventilation grilles 37 geoglyphs 37 Devil Slide tunnel 37 Baku Supsa pipeline 37 Furka 37 Conrail tracks 37 Marib Dam 37 steel truss bridges 37 Egyptian pyramids 37 Otay Mesa warehouse 37 affects hibernating bats 37 catenary 37 kilovolt lines 37 thruways 37 rocky gorge 37 falsework 37 EAB larvae 37 Beijing Fangshan district 37 Outerbridge Crossing 37 glass prisms 37 headrace tunnel 37 ease traffic congestions 37 Lake Champlain Bridge 37 drystone walls 37 railheads 37 freeway interchanges 37 concrete caissons 37 Jeddah Makkah Expressway 37 Bhalulata 37 grottoes 37 stair towers 37 diggings 37 Byzantine Greeks 37 wood lath 37 henges 37 Sloans Valley 37 contractor Tube Lines 37 Nitzana 37 Dalston Kingsland 37 antitank missiles 37 EastLink tollway 37 Eel River Canyon 37 kilometer buffer zone 37 hiking biking trail 37 entrance ramps 37 lightning arrestors 37 dirt mounds 37 sniper rifles ammunition 37 railway arches 37 cloverleaf interchanges 37 quarries 37 Brynglas 37 headrace 37 Schoharie Creek 37 dams weirs 37 cranes bulldozers 37 dankest 37 water mains 37 Eglinton LRT 37 fingertip searches 37 earthen barricades 37 Explosively Formed Projectiles 37 Shmuel Elgrabli spokesman 37 trunklines 37 driverless trains 37 drainage sluices 37 flooded Quecreek Mine 36 slurry wall 36 labyrinths 36 Paoli Thorndale 36 routes 36 ADA compliant ramps 36 Gilboa Dam 36 Karni crossing 36 Cochenour shaft 36 Israeli Merkava tank 36 camel caravans 36 Hulton Bridge 36 O Bahn 36 parapets 36 Incan ruins 36 oak timbers 36 Al Sufouh Tram 36 concrete girders 36 ornamental fencing 36 centimeter diameter 36 Fibre optic cables 36 interchanges 36 steep embankments 36 ant hills 36 Conveyor belts 36 jungle airstrips 36 arches 36 Anzalduas bridge 36 guardposts 36 Al Kibar reactor 36 trackless 36 tall granite obelisk 36 terminuses 36 orbital motorway 36 Hidalgo Reynosa 36 dams 36 contractor BEM 36 backyard treehouse 36 Jalameh 36 judged structurally deficient 36 steel pilings 36 CDTA buses 36 toilets reeked 36 supertall 36 Oroua River 36 Haramain Railway 36 bailey bridges 36 worrisomely porous 36 bombsites 36 rockfill 36 Sharif Nazarov 36 Wheelchair ramps 36 Wangjialing coal mine 36 jack hammers 36 Saqqara necropolis 36 labeled structurally deficient 36 iron roofed shanties 36 Monsal Trail 36 drainage culverts 36 iron girders 36 shotcrete 36 Throgs Neck Bridge 36 circular stairway 36 JERUSALEM Archaeologists 36 towering Gotthard massif 36 trails boardwalks 36 Baltic Sea bypassing 36 Bronx Whitestone Bridge 36 Abolhassan Astaneh Asl 36 stargates 36 Kensico Dam 36 nooks crannies 36 Girders 36 Rapid Transit trains 36 drainage grates 36 Schevenius 36 greenhouses 36 unfinished Wangjialing mine 36 karst limestone 36 Nahal Oz crossing 36 funicular railways 36 escalators elevators 36 rockfall hazards 36 pipe 36 subsurface aquifers 36 Spaghetti Junction 36 denuded hillside 36 doorways 36 divert Kishanganga waters 36 Trans Caprivi 36 foot overbridges 36 Badger Hydrovac 36 glacial boulder 36 Katusha rockets 36 rotting piers 36 rainwater seeped 36 anthracite mines 36 Amtrak Northeast Corridor 36 unexploded artillery 36 Alpazat 36 Blackwall Tunnel 36 FasTrak lanes 36 Gliding backwards 36 pervious paving 36 hydraulic pistons 36 Katyushas rockets 36 towers 36 opencast mines 36 pyroclastic material 36 disused mines 36 Nanpu Bridge 36 hazardous atmospheres 36 Caracas La Guaira 36 Coldwater Canyon Blvd 36 Overturned tractor trailer 36 organic heirloom tomatoes 36 Skyfari 36 Bosporus Straits 36 PATCO Speedline 36 gutters downspouts 36 Transmilenio 36 storage tanks 36 travelator 36 stone abutments 36 porticoes 36 Winnipeg floodway 36 concrete encasement 36 BNSF railroad tracks 36 pebble crusher 36 narrow alleys 36 compacted clay 36 Kevlar fiber 36 #mm artillery shells 36 survive Carbin 36 Tazara railway 36 sluiceway 36 trams 36 Bekka Valley 36 transcontinental railroads 36 waterwheels 36 Baywong 36 Krayot 36 Walt Whitman Commodore 36 devious traps 36 Beit She'an 36 Clem7 36 Tokaido Shinkansen 36 geotextile fabric 36 PATCO trains 36 asphalted roads 36 costal enclave 36 barbed wire entanglements 36 Reinforced concrete 36 Trucks hauled 36 vibro compaction 36 bottle necked 36 Mapocho River 36 ancient pyramids 36 wooden spools 36 #m #ft [002] 36 otherwise inhumanely disposed 36 stormwater pipes 36 Qassams rockets 36 redesigned Spaghetti Junction 36 3kms 36 Sinai Desert 36 Artisanal miners 36 Channel Tunnel Rail 36 Thameslink trains 36 chasms 36 steam locos 36 Weehawken Hoboken 36 bridge 36 explosively formed 36 basements 36 Northeast Corridor trains 36 salt caverns aquifers 36 Mechanical diggers 36 Cheonggyecheon stream 36 Chimney Point 36 Qassam launchers 36 monorails 36 subway stations 36 intake ducts 36 Whitestone Bridge 36 Herrenknecht 36 transbay 36 coquina rock 36 landmines planted 36 Kosi embankments