Specialized planes and vessels are scouring the ocean for the sub, which had been on an expedition to visit the wreckage of the Titanic.
"With respect to the noises, specifically, we don't know what they are, to be frank with you," Coast Guard Capt. Jamie Frederick said at a briefing Wednesday."...We're searching in the area where the noises were detected."
Deep Energy, a ship that lays pipe on the seabed, has rushed to the scene and sent robots into the water. A Coast Guard photo shows the ship at sea, its deck packed with huge pieces of heavy equipment. The Canadian Coast Guard contributed the Atlantic Merlin, which has an underwater robot, and the John Cabot, a ship with side-scanning sonar capabilities to capture for more detailed images.
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