GRE General Test: SE-711095 GRE Sentence Equivalence

The SWAT team entered the dark building on high alert, their guns drawn and their night vision goggles on; each agent’s eyes and ears were attuned to the slightest disturbance in the _____ recesses of the rooms.
Select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning