we'll talk to erik van sebille, about ten minutes away. >>> meanwhile, happening right now, the olympic hero accused of murder back on the witness stand. oscar pistorius is just getting grilled this morning by prosecutors as he tries to explain, tries to justify why he shot and killed his girlfriend. we're live with the latest next. your education is built to help move your career forward. here's how: we work with leading employers to learn what you need to learn so classes impact your career. while helping ensure credits you've already earned pay off. and we have career planning tools to keep you on track every step of the way. plus the freshman fifteen, isn't really a thing here. and graduation, it's just the beginning. because we build education around where you want to go. so, you know, you can get the job you want. ready, let's get to work. >>> good morning. welcome back to "early start." more dramatic testimony at the oscar pistorius murder trial. the former olympic blade runner back on the stand, the witness stand, again today, being grilled as the cross examination continues. a

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. >> but let's bring in erik van sebille. rapher at the university of new south wales in sydney. erik, we've had you on the show before and you've been so helpful in helping us understand what we're dealing with here in terms of the terrain. one map that i saw showed that part of the search area, at least previously, was over something called broken ridge, that makes it so extremely difficult to find anything, and we are specifically in search of the data recorder, the black box. tell us about this terrain and how much more difficult it's going to make it for all of those searching to find anything. >> absolutely. it is very rugged terrain. it's like a mini himalayas underneath the ocean. and why it's so difficult to search in an area like that is because the pinger, the signal that the black box sends, is essentially sounds. and sound, like anybody who's been in the mountains knows, there's a lot of echoes around. so, even if you were to hear it at some point, it's really hard to locate where it comes from, because there's ju

i was listening to erik van sebille, who is an oceanographer we've had on the show over the past fewks, and he was saying, you know, these currents are so huge and they're nothing like a highway that would drive debris in one direction. they are churning constantly, throwing, you know, throwing anything that may be out there all around, making it that much more challenging. then when you complicate it with bad weather, well, that makes it even harder. the weather there now for the search, it looks pretty decent. >> reporter: yeah, it really does. you know, fair is how it's being described. and the reason why we're calling it fair is because the clouds are a bit lower than we'd like. the clouds are about 1,000 feet above the ocean, so the planes have to get down pretty low to be able to scan effectively for debris. planes can fly 300 feet above the ocean, so that's no big deal for them. but yeah, the waves, you're not seeing the white caps out in the search zone today. the white caps can be very confusing for somebody who's looking, trying to spot an object and you see a white cap on