looking for evidence, specifically for the hard drive missing om the home of the terrorist couple syed farook and tashfeen malik. we saw what was left of their home office. the guts of the compur have been taken away by authorities. whether they're ablblto get all of the information that is on these types of devices, that's a question as to what type of damage the water has done. and/or if they tried to damage the devices. >> repepter: but the search at the lake also provides a new possible timeline. is it possible they were here? >> it's possible they were at this park, yes. >> reporter: specifically at the park and lake between the time of the rampage and that critical for investigators trying to piece together who they may have worked with. that, as abc news has learned that enrique marquez, farook's friend whose assault rifles were used in the rampage, blabbed to others like this man, nick rodriguez, about sleeper cells that were "just waiting" and suggested that "when it t ppens it's going to be big." confirming what another friend of marquez already told us. >> he said something along the lines of, like,