在地下

underground

to exist; to be alive / (of sb or sth) to be (located) at / (used before a verb to indicate an action in progress)

local

-ly / structural particle: used before a verb or adjective, linking it to preceding modifying adverbial adjunct

earth / ground / field / place / land / CL:片[pian4]

underground / subterranean / covert

down / downwards / below / lower / later / next (week etc) / second (of two parts) / to decline / to go down / to arrive at (a decision, conclusion etc) / measure word to show the frequency of an action