Canadian officials investigating the submersible that was lost during a deep-sea dive to the Titanic wreckage will examine voice recordings and data from its mothership, the Polar Prince. The Transportation Safety Board of Canada wants to determine what happened and whether any criminality occurred. Investigators also plan to analyze the vessel's voyage data recorder and other systems for useful information. While voice recordings may be beneficial to their investigation, the focus is not to assign blame, says TSB Chairwoman Kathy Fox. Authorities are assessing whether the case warrants a criminal investigation. The US Coast Guard has found debris indicating that the sub suffered a "catastrophic implosion" about 1,600 feet from the bow of the Titanic. The bodies of the five occupants are unlikely to be recovered.