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Bluefin-21 still engaged in that fifth dive. overnight it reached new depths, a fourth dive. it reached some 4.7 kilometers beneath the ocean surface, instead of the 4.5 originally thought to be at the upper reaches of its depth capacity, and that's important. because as you may remember, it had to cut its first mission short because it reached waters that was too deep for it to be programmed to be able to handle, and therefore, it resurfaced. and this is a really critical area of the search, given it's the most likely place they believe they are going to find the black box. now, the engineers...

Aircraft combing the indian ocean. cnn's erin mclaughlin live for us this morning in perth, australia. erin, what's the latest? >> reporter: good morning, christine. well, officials so far still confident they are looking in the right place for the missing plane. as far as we know, the fifth dive still under way, the fourth having concluded overnight. and during the fourth, they reached new depths, some 4.7 kilometers beneath the ocean surface, instead of the 4.5 originally thought to be at the very edges of the bluefin-21's depth capacity. engineers having analyzed the bluefin-21's hardware, ...

The seabed for any signs of the missing malaysian plane flight 370. we are hearing more details about the fourth dive that took place last night. we're hearing that it managed to dive some 4.7 kilometers beneath the ocean's surface. that's significant because it was previously thought it had a depth capacity of 4.5 kilometers, and engineers had taken a look at it, given the fact it had to cut that first trip short. they believe it now can withstand some five kilometers of water pressure. they sent it back down reaching that 4.7 kilometer mark. that's really significant because it shows it can ...

110 square miles. meantime, the search for debris on the surface continues with nearly two dozen ships and aircraft combing the indian ocean. they have found nothing after more than 40 days. cnn's erin mclaughlin live in perth, australia. so much hope, erin, in this underwater search in the bluefin. >> reporter: good morning, john. overnight, the bluefin-21 reaching new depths in the search for missing malaysian flight 370. during that fourth dive, it managed to go down some 4.7 kilometers beneath the ocean surface, compared to the 4.5 kilometers originally believed to be on the upper reaches ...

>> we've been talking about the search under the sea. search on the surface has not let up either, almost two dozen ships and planes are eye balling more than 20,000 square miles for any sign of debris. let's check in with aaron mclaughlin. good morning. what's the latest? >> reporter: good morning, john. we know as of 9:00 a.m. local time, the bluefin was in the water over 12 hours later, not clear if it has yet completed that fifth mission. missions can take some 24 hours. we are learning more details about that fourth dive, which it completed last night. it was able to travel some 4.7 kilom...