The protest is triggered by a new bill from the Ministry of Labor, which increases the daily working limit to 13 hours.
The strike began at 6:00 a.m. today and is scheduled to end at the same time tomorrow, Tuesday, June 24.
The union emphasized that both its leadership and rank-and-file members unanimously agreed to continue the strike.
Sources within the Ministry of Shipping indicated that in Patras, Greek-flagged passenger and vehicle ferries are currently not operating due to the strike, affecting four vessels.
The strike has left hundreds of passengers and scores of lorries waiting for the maritime routes to reopen.
The union is demanding more hirings and condemning what it claims are unfulfilled commitments by coastal shipping owners and the state
PNO industrial action on Thursday and Friday is expected to cancel most ferry boat routes in Greece
The Panhellenic Seamen's Federation (PNO) is demanding wage increases and better working conditions, pointing to rising company profits that aren't shared with workers. This follows a similar strike by 45,000 U.S. dockworkers.