BATH, Maine (AP) — A shipyard workers’ union in Maine said Wednesday that talks with a Navy shipbuilder appear to be “breaking down” amid a strike that has gone on for more than a month.

The Machinists Local S6 union that represents about 4,300 workers at Bath Iron Works resumed negotiations with the shipyard this week. The union posted on Facebook that it made some progress on Tuesday, but “negotiations appear to be breaking down as the bigger issues are being addressed.”

A spokesman for the shipyard declined to comment Wednesday. Bath Iron Works is one of the largest shipbuilders for the Navy.

The union went on strike June 22 after rejecting a contract offer. The contract dispute centers heavily on subcontractors, work rules and seniority.