"Intensified search for missing Titanic sub with global support"

The search for the missing submersible carrying five people near the Titanic wreckage site has ramped up with two ships deploying deep-sea robots. The search area has expanded to about double the size of Connecticut, and while search planes detected banging noises coming from under the water, there has been no confirmed contact from the sub. The sub is believed to have carried enough oxygen to last the crew 96 hours, which means it could run out Thursday morning if it hasn't already. The search is still a rescue operation, but fear is mounting that oxygen in the vessel may already have run out.