4 ms·
The tunnel is over 30 miles long, 31.4 miles or 50.5 km. The tunnel must first go deep enough to go under the sea on either side, adding to its length.
by lorenzhs 9y ago
The tunnel is over 30 miles long, 31.4 miles or 50.5 km. The tunnel must first go deep enough to go under the sea on either side, adding to its length.