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Wreckage will stand out when they run side scan sonar. >> they haven't done topography mapping so it's like you're starting from scratch. >> a little bit, wolf. you heard the previous commentator talking about what we know about the bottom there. the good news is hms echo is nearby, fitted with the right type of gear to gi a very sort of quick ocean bottom map expedition that could be the information that would help move this faster. >> how deep can navy divers go? >> navy divers generally about 1,000 feet for man diving. >> so there's no way there's going to be anybody down -- you have to sen...

And we're not talking years. >> van, how long do you think it will take? obviously, the search team has been very, very cautious on this and said it could take weeks and months, even with the information they have for that autonomous vehicle to pick up any debris, if there is debris down there? >> well, the problem we're going to run into from here on out, the operation will start going slower and slower, at least as we're watching it externally because they have to be incredibly careful. so what they've announced is they're going to continue to drag the towed pinger locators through the area ...

They still consider in the most promising lead they have so far. >> of course the focus has been on the efforts of the ocean shield an the u.s. pinger locater, but there are other searches underway in other areas. why is that? and explain to us what is going on. >> that's right. you have the chinese find from days previous. they detected their own signals them hms echo out there investigating that. right now authorities in perth are saying the ocean shield's finds are the most promising lead. 14 planes and 14 vessels out there scouring the waters in search of di debris. no sign of the plane so...

There's one search area that has been dramatically reduced in size, from 90,000 square miles or thereabouts, down to 30,000 square miles. so two-thirds, they've shaved off of it, because of the leads that they're investigating. but there are a couple of different search areas within that, in the north of that area, that's where we're seeing the "ocean shield" scan the ocean bed, to try to recapture those electronic signals. in the south of that area, still the chinese vessel there, which detected those apparent pings as well. different pings, we understand, possibly. 300 nautical miles away. t...

Reacquire these pingers, also get the best measurement of depth there. and i think they'll probably get that using "hms echo." >> go ahead, richard. >> a quick question for you, david, what is the length of the search season, if you like, before the weather turns nasty and they would have to think about postponing for winter, regrouping, if they don't find it, and starting again in the next season. >> but aren't these warmer waters where they are now? do they really have to worry about that in these particular waters? >> these are much better. it's a completely different scenario than what the...