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coast of myrtle beach, south carolina, collecting the wreckage of the downed balloon. republicans are condemning president biden for failing to take action on the balloon sooner. let's get the latest on the balloon and today's recovery efforts, zachary cohen is here. zachary, what more are we learning about this balloon and, i guess, at some point, they need to pull it up out of the ocean and start examining it. >> i think at this early stage, u.s. officials are not buying the chinese government's explanation that it was a civilian aircraft. they have strongly indicated, defense offi...

By Nouran Salahieh, Eric Levenson, Priscilla Alvarez and Ray Sanchez, CNN

Crews searching for the Titan submersible heard banging sounds every 30 minutes – and four hours later, after additional sonar devices were deployed, banging was still heard, according to an internal US government memo.

It was unclear when the banging was heard Tuesday or for how long, based on the memo. A later update sent Tuesday night suggested more sounds were heard, though they

Have the capability. they've done this before. >> reporter: retired navy captain chip mccord has been involved in at least 50 ocean salvage operations include twag 800 800 and swissair which crashed in 1998 off the coast of nova scotia. the vehicles are equipped are lights and cameras and are outfitted with sonar to skoutd for debris. they are steered by two operators on board the ship above who use instant feedback if the salvage vehicles' cameras to direct the robotic arms. >> they can hover, they can move left right, forward and aft and go to what they need very carefully hover over a piece...