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The boatyard of Spyros is in the north from island Aegina. It has a dock fore haulout by travellift and fair prices for the winterseason. All kind of boatworks can be organised. There are lots of ferrys to piräus and it is possible to go there in less than a hour from the boatyard.
Attention: there is no good Anchorage close to the dock (rocky ground and swell)