Crossings

thumb|right|Tunnel in Col du Galibier, France thumb|right|Tunnel in Fort de Mutzig, France thumb|Decorated portal to a road tunnel in Guanajuato, Mexico thumb|Utility tunnel for heating pipes between [[Rigshospitalet and Amagerværket in Copenhagen, Denmark]] thumb|Tunnel on the Taipei Metro in [[Taiwan]] thumb|Southern portal of the Chirk Tunnel|Chirk canal tunnel, Wales thumb|Victory Tunnel in [[Shimla, India was opened on 08 May 1945 after the Allied victory in World War II]] thumb|Atal Tunnel in [[Himachal Pradesh, India was opened on 4 October 2020 which connects Manali and Keylang, bypass

passages of passengers and cargo across the Atlantic Ocean

a tunnel that floats underwater, deep enough to avoid water traffic and weather