Seven agency staff were sacked by P&O Ferries for violating guidelines on alcohol consumption.
The company said that the safety of their passengers and crew is their foremost priority and that they have a zero tolerance policy towards drinking while on duty.
P&O replaced 800 UK seafarers with cheaper agency staff.
A protest march was held on Tuesday.
The unions called for action at several ports after 800 workers were sacked via video message.
The latest incident was absolutely scandalous, according to the RMT.
He said that they could end this today by saying to the RMT that they have made a mistake, that they have compromised safety, that they have jeopardised their reputation in the local community, and that they want to.
The P&O fleet is still waiting for safety clearance from theMCA.
P&O had to change its business model because it was losing money.
It had hoped to resume sailings over Easter, but two of its ships failed safety checks.
P&O has been accused of treating its staff, passengers and the people of Kent with contempt.
John Lansdown, a former ferry chef who was sacked and is suing P&O for unfair dismissal, racial discrimination and harassment, said he was sickened and distressed over the way he and his colleagues were treated.
He said that there was no end in sight to the chaos caused by the actions of P&O ferries.
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