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It is the deepest subsea road tunnel in the world. The figure is taken from Statens vegvesen, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Mondo Knows Facts

Norway's Ryfylke Tunnel dips 292 metres below the sea

It is the deepest subsea road tunnel in the world

The Ryfylke Tunnel near Stavanger runs for 14.4 kilometres under a fjord, reaching a maximum depth of 292 metres below sea level with gradients up to seven per cent. Norwegian tunnelling uses drill and blast through hard granite, which is cheaper there than boring machines. The steepest sections are lit to reduce the illusion of climbing.

Fra Bratlandsdalen, Ryfylke - NB MS G4 0600 — Marthinius Skøien · Public domain · source

Where this comes from

Statens vegvesen

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Tags: tunnels, norway, fjords

Norway's Ryfylke Tunnel dips 292 metres below the sea: the short answers

Where does this come from, and can I check it?: It is the deepest subsea road tunnel in the world. The figure is taken from Statens vegvesen, 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 1,090 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.