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Powerful. no one knows how many tons of munitions are lying on the seabed. long estimates that there could be up to a million tons off the coast of nova scotia alone. but only a few of the locations have so far been identified. and it's by no means clear which kinds of munitions are involved what. the situation is not confined to north america the first shots of world war two were fired at the polish port city of good danes on september first one nine hundred thirty nine. now polish scientists are searching for hazardous wartime materials. there's no documentation so they have to search the se...

The bad weather posed another problem once again. and crews have not been able to recover any more bodies. so far, 30 bodies have been conferred. a u.s. ship is part of the recovery efforts. the "u.s.s. ft. worth" is there. david molko, with the objects found, unable to retrieve it. what's the hope for later on when the search resumes? >> reporter: yeah fredricka, when the sun comes up here in a few hour sunday morning, we're hearing weather conditions are going to improve significantly, at least for 24 hours. that means you're going to see waves in the range of seven feet instead of 17 feet. ...

Data that we're working off of? do you think it's accurate? people have questioned whether we're out there searching in the right area. >> reporter: look, indeed, don. and this is not an exact science. we have to understand that. and we must remember with air france 447, it was 18 missions with the -- the side-scan sonar device that they used in that particular search. and it was found about six miles from where they thought it was. so there is a precedent for this not being an exact science. i think we have to give them a bit more time. >> yeah. there's a precedent for that. but you know, we ...

And angus houston were very confident that these pings would lead us straight to the wreckage. what does that say about the data that we're working off of? do you think it's accurate? people have questioned whether we're out there searching in the right area. >> reporter: look, indeed, don. and this is not an exact science. we have to understand that. and we must remember with air france 447, it was 18 missions with the -- the side-scan sonar device that they used in that particular search. and it was found about six miles from where they thought it was. so there is a precedent for this not be...

Shouting. this was delayed. these fed up families, you see them here? they stormed out of this briefing. what are the challenges here? earlier the head said the sonar device will help move the searchers step further but he stopped short of pinning all hopes on the suv. >> i would caution you that the deployment will result in the detection of aircraft wreckage. however, this is the best lead we have and it must be pursued vigorously. >> she is back on a boat for this live demonstration of the sonar technology. so as we talk about the auvs, and we talk about sonar, that's