Wait, rereading the elevator part of the round message makes me believe I (we?) misunderstood. We shouldn't need to break down any wall, just go to any tile near the black tiles and we should be able to call the elevator with buttons (assuming we have energy). The black isn't metal, it's a hole, because the elevator isn't there. I had assumed that the elevator was only J5, and the other blacks was where we had to reach, but it seems like all of it is the elevator. So no hole needed I believe, unless we thik there is anything to do in the elevator shaft (probably not)