Picture of Deep Waters coloring page

Deep Waters

by Angela R.

Seikan Tunnel

The longest underwater tunnel in the world is called the Seikan Tunnel. It's 14 and half miles long and it is about 330 feet under the seabed. The tunnel was created to connect a railway between the main and northern islands of Japan. The tunnel took 5 years to complete and cost about 3.6 billion (US) dollars.