Crew onboard the mothership that towed the doomed Titan sub before its "catastrophic implosion" have been banned from leaving the vessel amid a probe.
MV Polar Prince was among four vessels which returned to St John's in Newfoundland today, after four passengers and the pilot of the underwater vehicle were killed in the incident near the wreckage of the Titanic.
As soon as the boat was secured at the dockside, it was boarded at 8am ET by a team of US and Canadian federal investigators who are now set to determine how the implosion took place.
