“The dream of a US-Russia link via the Bering Strait reflects an enduring vision – from the 1904 Siberia-Alaska railway to Russia’s 2007 plan,” Mr Dmitriev wrote.
“RDIF has studied existing proposals, including the US-Canada-Russia-China railroad, and will support the most viable.
Asked about the idea during a press conference with Ukraine’s President Volodymyr Zelenskyy on Friday, Donald Trump called it “interesting”.
“Traditional costs are $65B+, but @boringcompany’s tech could reduce it to future together,” he added
https://news.sky.com/story/donald-trump-responds-to-idea-of-tunnel-connecting-russia-and-us-13452151
The Bering Strait is subject to frequent earthquakes and has almost no existing infrastructure, partly because of the prohibitive difficulty of working in below-freezing temperatures, making the completion of such a project difficult to achieve.
https://www.yahoo.com/news/articles/trump-ponders-undersea-tunnel-linking-124357467.html