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hed get off roseanne, lose 60 pounds and gain it back and hopefully these lifestyle changes stick and we wish him luck keeping it off. thanks for joining us. "ac 360" starts now. good evening. tonight on 360, the race to prevent another titanic disaster. five people in a tiny submersible. hunter bidens plea deal on tax and weapons charges. republicans say he got a sweetheart deal. tonight we look at the facts. the kremlin plot to kill a high ranking official. good evening. we beg...

five people in a tiny submersible last known whereabouts, 13,000 feet under the sea. some 33 hours of air left. also tonight, hunter bidens plea deal on -- we look at the effects. and the plot to assassinate a russian defector on american soil. good evening, we begin now with a desperate search for the oceangate titan. a miniature submarine with five people inside. they hoped to visit the right of the titanic on the ocean floor in the north atlantic but now they face a disaster of thei...

The risks involved, can you talk about what might have happened with this submerse snibl i understand it has multiple systems to shed weight to allow it to surface unless it was somehow trapped under -- in some sort of -- somehow trapped under the water. >> yeah. we really are in the realm of speculation at the moment so frankly nobody knows unless youre on the vessel itself, but what could have happened is that the -- there could have been an electrical failure on board. the systems are shut do...

>> we are really in the realms of speculation at the moment. frankly, nobody knows unless you are on the vessel itself. what could have happened, it could have been a logical failure on board. if the systems are shut down clearly the communications are not working since sunday after the one hour and 45-minute descent. what is supposed to be happening in the scenario, the submersible is supposed to drop the weights and given these remarkable as might of a carbon composite material, it is supposed...

>> and well go live to paris in a few minutes and talk to cnns jim bittermann, who watched the entire interview. and now on u.s. soil, investigators in nevada may have found clues that could help them figure out what caused the deadly plane crash at an air race in reno. they recovered parts from the planes tail and right now the death toll stands at nine. dozens of other people were hurt and today were hearing more from witnesses. >> just happened so fast, just split second event so,...