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I was thinking just the same and so I went on the link to the masterplan 100 page report http://www.gov.gg/CHttpHandler.ashx?id=81041&p=0 Everyone should read this, it's paid by tax payers. As I understand the difference in costs is to do with different types of breakwaters, the first price is for a piled Jetty and the other is a full depth breakwater ie. alot more concrete needed and this is supposed to give more shelter.