Floor Lowering
Tunnels can also be enlarged by lowering the floor.
Read more about this topic: Tunnel
Famous quotes containing the words floor and/or lowering:
“Cats walk the floor at midnight; that enemy of fog,
The moon, wraps the bedpost in receding stillness....”
—Allen Tate (1899–1979)
“Science is a dynamic undertaking directed to lowering the degree of the empiricism involved in solving problems; or, if you prefer, science is a process of fabricating a web of interconnected concepts and conceptual schemes arising from experiments and observations and fruitful of further experiments and observations.”
—James Conant (1893–1978)