Due to a massive earthquake, an underground portion of Tokyo has been separated from the outside world.

However, the underground portions remain flooded with up to a meter of water, and the galleries are not safely accessible.

However the underground portion of the latter is blocked by a rock fall.

The underground portion was the costliest section of the entire rail project.

"The team found an unfinished site, the underground portion of which was an extensive, empty tunnel complex," he said.

The C train runs local on the underground portion of the line at all times except late nights.

For example, the underground portion of Boston's Green Line, which opened in 1897, had been light rail.

The station is divided into an elevated and underground portion, each serving different lines.

Thirty cents will buy a trip on only the underground portion of the line.

AT&T is now filling the small underground portion before sale, unless they sell to a major company.