Some of this underground space now serves as a gym; the rest was transformed from culinary use into a cinema with a red and gold swirly-patterned carpet.

The underground space would also be used for parking.

To provide for this line, a much larger underground space was excavated than necessary for a simple station.

In 1914, the 254ha acre fort comprised 50 buildings, with an underground space of approximately 40,000 square meters (400,000 square feet).

Many land use restrictions and permitting requirements do not apply to underground space.