(名詞) 超級隧道 — 非常長的隧道或建得非常好的隧道。亦寫成 super-tunnel

Sir Albert Bore, leader of Birmingham City Council, said that could take the form of joining up the tunnels or even creating a motorway under the city.

Dr Pat Hanlon, a transport expert at the University of Birmingham, said a "supertunnel" could not only improve congestion, but open up parts of the city for building, allowing key areas such as Great Charles Street and the Colmore business district to be joined up.
—"Birmingham outlines £4bn tram and bus plan," BBC, November 13, 2014

In the past quarter century, officials have discovered a hundred and eighty-one illicit passages under the U.S.-Mexico border. Most have been short, narrow "gopher holes" just big enough for a person to crawl through. Sinaloa specializes instead in infrastructural marvels that federal agents call supertunnels. Agents estimate that a single supertunnel takes several months and more than a million dollars to build.
—Monte Reel, "Underworld," The New Yorker, August 3, 2015