Subterraneous in a sentence as an adjective

V=vI-JF28T44U Using a type of subterraneous mapping lasers I imagine as you see some kind of globular markers dotted around the cave as you pass through. Unable to find exactly what tech they used for this.

Subterraneous definitions

adjective

being or operating under the surface of the earth; "subterranean passages"; "a subsurface flow of water"

See also: subterranean

adjective

lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed); "subterranean motives for murder"; "looked too closely for an ulterior purpose in all knowledge"- Bertrand Russell

See also: subterranean ulterior