Search and rescue teams are racing against the clock as they attempt to find a missing submersible and its five-person crew that was slated to explore the wreck of the Titanic nearly 13,000 feet under the North Atlantic on June 18. The U.S. Coast Guard said that the 22-foot-long deep-sea vessel, dubbed the Titan, only has a few days worth of oxygen. The craft is owned and operated by OceanGate, a private submersible company that offers chartered trips to the wreckage of the Titanic to customers for $250,000 a seat. It set out on its voyage on Sunday morning, but...