Toad Pinger News Today : Breaking News, Live Updates & Top Stories | Vimarsana

>> so, here is the bottom line -- if the blue fin 21 comes up empty next week, it will be time for all search crews hunting for flight 370 to stop, regroup and reconsider the whole search operation may need a reboot at that stage. so, i want to bring in aaron mclaughlin who is at the search base in perth, australia. as we hear this news, is it good news, is it that they have greatgreat er confidence that they are close to finding it or if they don't find it in the next week or so they're looking in the wrong place? >> reporter: hi, jim, as far as we know there's no new information or data that...

>> reporter: we've been talking a lot about the high-tech devices that have been turned loose to listen for pings off the ocean floor. like the toad pinger locater and there's been word of the buoys being dropped out there. but any device listening in the deep ocean faces unique challenges because sound does very strange things traveling through all of that deep water. here's just one of the challenges out there. there's a layer about a half mile down in the water here that is a naturally occurring thing. and this layer of water actually allows sound to travel through it slower than it does ab...

Area until they are 100% sure the black box batteries are dead and there is zero chance a new signal or lead is heard. >> the biggest concern is time because there is a finite amount of time they will be transmitting and we are trying to maximize the use of the toad pinger to detect while we can. >> the was talk they already ran out of batteries since there were three days of quite under water. now officials are optimistic the batteries have a little juice >> let's hope. especially for the search. one time they get getting signals from a ship itself on the ship. how sure are they it is this

Equipment used to locate the pings. if the box goes dead, they will switch to a sonar search for identify what is consistent in size and shape with flight mh370 black box's. >> when the acousting beacons are no longer emitting we will switch to a sonar search for with a shorter detection range and tough processes. and whether we locate it or not with the toad pinger the area we are in will be a high area we will conduct the sonar search. >> reporter: that is the last step, but there is a willingness to do that. >> when and if they bring up the

Very choppy seas. but the air is going to cover by far the biggest area and then a visual conformation. >> and that is when we can put the toad pinger in the water. best of luck for your team. we are rooting for you guys and hope for good news soon. >> oscar pistorius could soon take the stand. prosecutors have rested and the defense is going to present his case. why might here his version of what happened the night he shot his girlfriend.