Officials investigating the doomed Titanic submersible will examine voice recordings and other data from its mothership to try to determine what happened and whether any criminality occurred, according to reports.

Investigators with the Transportation Safety Board of Canada visited the Polar Prince, the OceanGate Titan sub’s lead ship, Saturday “to collect information from the vessel’s voyage data recorder and other vessel systems that contain useful information,” TSB Chairwoman Kathy Fox told CNN.

Fox said agency wants to “find out what happened and why and to find out what needs to change to reduce the chance or the risk of such occurrences in the future,” according to the report.

She said voice recordings “could be useful in our investigation” but insisted that the investigation’s purpose was not to point blame.

Meanwhile, authorities are working to determine whether the case warrants a criminal investigation, said Royal Canadian Mounted Police Superintendent Kent Osmond on Saturday.