Moscow Metro is one of world's busiest metro systems, serving more than seven million passengers daily.
Busiest
Both as a bomb shelter and a nuclear radiation fallout shelter. OR... The Busiest.
the busiest.
11.92 million (2012)
A slave is credited with freeing over 700 slaves using the underground railroad
The largest Moscow is in Russia, although there are Moscows in other countries.
London Underground is a rapid transit system in London, England. Part of the system consists of underground tunnels.
Kathleen Barr is credited for "additional voices" in Sonic Underground, it can be assumed that Kathleen Barr voiced the various background characters in Sonic Underground rather than just a single character.
Guildford hasn't got an Underground system, so no underground trains.
a hydronic system
Brunelleschi
Where an underground electrical distribution system is most likely to be found is underground.