let's dig deeper now with chris mcglocklin at marseilles. >> reporter: the malaysian government made the announcement today that the plane went down in the indian ocean. how confidence is the company that that is what happened to 370 that it ended in the water. >> very reluctantly, we've been looking at the ping data for the last six or serven days, comparing it with other malaysian airlines, triple 777 in the region and looking at the flight data we can get from the pings. we mapped those pings against the southern and northern route. i can say there's a strong correlation with the southern route, and absolutely no correlation with the north, that it went south. >> you can rule out that northern route? >> yes. >> can you say, though, that with 100% certainty, that the plane ended up in the water? >> we have to bow to the honors that the investigation team has. we can say that we saw the plane in a number of pings to the network, the period of hours cone sides with the amount of time the malaysians say it was fueled up for, and that would tie in with some seven pings or communication