underwater tunnel
Beneath-the-waves corridor
An underwater tunnel is a passage constructed beneath a body of water—a river, harbor, or strait.
Unlike bridges, underwater tunnels maintain unobstructed water traffic above and withstand weather conditions that might close surface crossings.
They serve roads, railways, or utilities: The Channel Tunnel connects England and France beneath the English Channel.
Construction typically uses boring machines or immersed tube sections.
- metro systemUrban underground railway network
- train stationPassenger boarding facility for locomotives
- engineering marvelImpressive feat of construction
- excavationAct of unearthing
- glassTransparent solid from sand
scuba gear · concrete · immersed · deep dive · waterproofing · air lock · boring · caisson · structural integrity · ventilation systems · escape route · freight transport · underwater welding · echo · subaquatic · marine ecosystem · crossing · fluorescent
- underwater facilitiessubmarine base, underwater habitat, research station, underwater museum
- underwaterunderwater, submerged, immersed, sea bed, seabed
- aquariumdolphin, penguin, fish tank, ray, octopus
- underwater placesunderwater cave, underwater canyon, ocean floor, seabed, sea bed
- tunnelsportal, bore, TBM, Chunnel, rail tunnels
- underwater structuresunderwater cave, underwater habitat, artificial reef, underwater museum, research station
underwater tunnelbridge
Structure spanning an obstacle
overpass · viaduct · elevated highway · suspension bridge · skyway