Employees at the Clyde Coastguard centre have staged a walkout over plans to close the base.
The staff stopped their duties at 11am on Saturday for a one-hour strike to underscore their objections to UK Government plans.
The facility at Greenock and Forth Coastguard’s headquarters at Crail are two of nine stations facing the axe under coalition reforms.
Organisers at the Public and Commercial Services Union have warned that the closure could put lives at risk by depriving rescuers of local knowledge.
Industrial action will continue after Saturday, alternating between the night and day shifts up to and including the day shift on Friday, June 15.
Walkouts will take place between 3am and 4am during night shifts and between 11am and noon during day shifts.
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