With only hours of oxygen left in the submersible that was touring the Titanic, it has gone missing over the wreckage. By 12 pm on Thursday, the oxygen will be depleted. The sub, carrying five people, has been missing since Sunday when it lost all contact while exploring the wreckage of the famous ship 13,000 ft under the sea. GB News said the US is holding up a possible rescue. Rescuers say it’s not a rational decision. Even if it is located, it would not be easy to rescue those on board, given the depths. It’s down about two miles....