>> the families must take encouragement from what you have announced today. but as you said that confirmation must be visual from the autonomous sub. when is your understanding of when the sub could go down? do you have a time frame in mind, five to ten, 20 days. >> you mean the autonomous underwater vehicle? >> yes. >> we will send it down when we have exhaust ed the possibilities in terms of the surface search. this is a personal opinion. i don't think that time is very far away at all because i think the last signal we got was a very weak signal. if we continue to get signals, though, we will continue to search. for the simple reason that the