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There is 2.8 miles deep and that is roughly the limits of the operation of that -- of the underwater vehicle theyre carrying. so it may entail them taking out other submersibles. at the same time, the battery life on the black box is beginning to run out. they talk about it being for 30 days. we dont know how much more life there is in the black boxes. so certainly there are still challenges as they try and reacquire that signal, francis. >> certainly a crucial next couple of days. thank you so ...