This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Situated or occurring below the surface of the ground: belowground telephone cables.

adj. beneath the surface of the ground; underground

adj. under the level of the ground

adj. 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."

subsurface    inhumed    buried    interred   

plastic-lined    away    fourteenth-floor    daylit    concrete-lined