An international group of agencies is investigating what may have caused a submersible to implode while carrying five people to the Titanic wreckage. Working closely together on the probe of the June 18 accident are investigators from the U.S., Canada, France and the United Kingdom. Evidence is being collected in the port of St. John’s, Newfoundland, in coordination with Canadian authorities. Chief U.S. Coast Guard investigator Capt. Jason Neubauer has not given a timeline for the investigation. The Coast Guard also hasn't indicated whether it will pursue sanctions. Neubauer says hi...