By JENNIFER McDERMOTT, PATRICK WHITTLE and HOLLY RAMER (Associated Press) As an international group of agencies investigates why the Titan submersible imploded while carrying five people to the Titanic wreckage, U.S. maritime officials say they’ll issue a report aimed at improving the safety of submersibles worldwide. Investigators from the U.S., Canada, France and the United Kingdom are working closely together on the probe of the June 18 accident, which happened in an “unforgiving and difficult-to-access region” of the North Atlantic, said U.S.