RMT general secretary Mick Lynch said: “The reports of the European Causeway drifting in water off Larne having lost all power are deeply concerning, not least for the agency crew and passengers onboard.
“Since our members were viciously sacked on 17 March, this vessel has been detained by the MCA for failing a raft of safety checks.
“The list of offences is now as long as your arm and the Government has to step in and protect ferry safety and jobs.
“P&O and their pay masters in Dubai are no longer capable of running a safe service and should be stripped of the licence to operate their ships.”
