adjective. Situated or occurring below the surface of the ground.

adjective. beneath the surface of the ground; underground

adjective. under the level of the ground

adjective. underneath the ground

"As for force fields, we can also set up a grid that would throw a blanket over the entire building above- and belowground."

buried  inhumed  interred  subsurface  

away  blue-carpeted  blue-tiled  concrete-floored  concrete-lined