below and above at this time. >> can you please talk about the tactics that your teams are using? you mentioned going above -- >> so, throughout the night, no different than from when we began operations. so, as the heavy machinery comes in, we will begin removing some of the debris above, some of the light debris. as we place those devices to look for voids, we start looking for additional victims. we are looking for -- we are listening for sound. it's not specifically human sounds. it could be tapping. it could be steel, you know, kind of twisting. it could be some of the debris kind of raining down. we concentrate on those areas. from below we continue using light machinery. saws, jackhammers as we continue to tunnel through underneath.