A Central Japan Railway Co. official explains the progress of construction for the Linear Chuo Shinkansen project, starting with an 83-meter-deep shaft in Tokyo's Shinagawa Ward. (Video taken by Shiro Nishihata)

Thirty-six meters wide, 83 meters deep. These are the dimensions of a vast vertical shaft created to start work on a tunnel for a train line from Tokyo to Nagoya--and running through it, the fastest Shinkansen in the world.

Central Japan Railway Co. (JR Tokai), unveiled the deep shaft for the ambitious Linear Chuo Shinkansen project on Nov. 28, with plans to open the new line in 2027 between Shinagawa and Nagoya stations.

High-speed trains using the magnetic levitation system will run at depths of more than 40 meters in certain urban areas and at blazing speeds of 500 kph.

The vertical shaft has a 6-meter-thick concrete floor at the bottom and is about 1.5 kilometers from the starting station of Shinagawa in Tokyo's Shinagawa Ward.

A disassembled boring machine will be transported to the site and lowered down the shaft. Once assembled, it will be used to dig the main line's tunnel toward Nagoya Station.

After the start of train operations, the vertical shaft will allow for ventilation and provide emergency exits.

Construction workers are now engaged in assembling reinforced steel to support the tunnel walls.