Transcripts for CNN Wolf 20140407 17:43:00

as well, you know, to the person that i've spoken to, wolf, the family members say that they really want concrete evidence before they believe or they know they can have some closure. they've had so many leads over this time. the satellite leads. the data analysis. and now the word that there might be this ping response from the bottom of the ocean. for people who want to know where their loved ones are, what happened to them, these are very kind of nonconcrete things. they want to grasp hold of something or see something. a bit of wreckage. and that reflects also what the searchers are saying in perth. until that point happens, i don't think these people can have any kind of closure and they've been stuck in this limbo for days and days and days, 31 days, in fact, as they hold this vigil awe through the night. in fact, tracking what exactly they know about what happened to the plane when it happened.