Where does this come from, and can I check it?

Its 50 kilometre bore links England and France beneath the seabed. The figure is taken from Eurotunnel, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a records & extremes fact?

Yes. It sits on the Records & Extremes shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

The Channel Tunnel is the longest undersea tunnel

Its 50 kilometre bore links England and France beneath the seabed The tunnel runs for about 50 kilometres between Folkestone and Coquelles, of which 38 kilometres lie under the English Channel. Three parallel tubes were bored: two for trains and a smaller service tunnel between them. It opened in 1994 after six years of construction, and boring machines met in the middle from both sides. It sits in Mondo's records & extremes collection, one of 200 facts that each trace back to the reference below.

Where this comes from

Eurotunnel

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Norway's Laerdal Tunnel is the longest road tunnelIts 24.5 kilometre bore runs between the villages of Laerdal and Aurland The Gotthard Base Tunnel is the longest railway tunnelIts two bores run 57 kilometres beneath the Swiss Alps Norway's Ryfylke Tunnel dips 292 metres below the seaIt is the deepest subsea road tunnel in the world Hong Kong Zhuhai Macao is the longest sea crossingThe 55 kilometre link includes a 6.7 kilometre tunnel under the seabed Garrett Morgan patented an early automatic three-position traffic signal in 1923The mechanical traffic signal introduced a warning caution position between stop and go Standard railway tracks measure four feet eight and a half inches wideTraditional wagon wheel spacing established global railway track gauge dimensions

Tags: tunnels, europe, transport

The Channel Tunnel is the longest undersea tunnel: the short answers

Where does this come from, and can I check it?: Its 50 kilometre bore links England and France beneath the seabed. The figure is taken from Eurotunnel, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a records & extremes fact?: Yes. It sits on the Records & Extremes shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.