On Wednesday, the U.S. Coast Guard said it is focusing its search in an area where rescue planes detected noises, similar to the sound of banging.
Those noises could lead crews to the sub, but the clock is ticking, with the oxygen set to run out by Thursday morning.
"It's sad. It's challenging," says Steve Nagiewicz, an adjunct professor of marine science at Stockton University. "The outcome isn't likely to be very good. Because it's in over 12,000 feet of water, it will be a complicated operation to get it to the surface. The people who are in the sub are sealed in. They can't get out until it reaches the surface, they're bolted in. This is a serious problem."Nagiewicz has a friend on the rescue mission who has explored this Titanic wreckage before."People ask me, 'Is it worth it?'" he says.
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