Chinese scientists propose 2,000km/h submarine maglev

"The concept is similar to Hyperloop, being essentially a rail gun in a vacuum tube. The novelty is that the tunnel would float in water, which would bear 90% of its weight.

The idea has been floated by three academics: Sun Jun, of the Chinese Academy of Sciences, and Yue Jialing and Gu Guobiao, who are members of the Chinese Academy of Engineering."

Proving once again, that while the U.S. plays games with government, and with the world, albeit highly dangerous games, China gets things done.  500 undersea tunnels already. And now they want to build a 2,000km speed hyper-train, twice as fast as anything Elon Musk has even proposed.
It's worth remembering China's gov't is stocked with engineers, while ours is stocked with lawyers, debaters, failed businessmen and TV personalities.