The U.S. Coast Guard says it's bringing in new ships and underwater vessels to search for a submersible that vanished while carrying five people down to the wreck of the Titanic. Capt. Jamie Frederick of the First Coast Guard District said Wednesday afternoon that the full search area is twice the size of Connecticut and 2 1/2 miles deep. He called it a search and rescue mission, adding “you always have hope.” But even those who expressed some optimism warn many obstacles remain. The vessel hasn’t been heard from since Sunday, and passengers are estimated to have as little as a day’s worth of oxygen left.
