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five people in a tiny submersible last known whereabouts, 13,000 feet under the sea. some 33 hours of air left. also tonight, hunter biden's 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 their own. they're slowly running out of air. that is, if they are still alive. we simply do not know. ...

>> 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 to go back up to the surface somewhere, which makes it a lot easier for the ships and airplanes to ...