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Landowners on sleepy Gambier Island are threatening to use a constitutional challenge in their fight to keep an old naval wreck from being sunk as an artificial reef in the pristine waters of Howe Sound.

It's the latest skirmish in the battle over whether the two thousand ton Canadian helicopter destroyer HMCS Annapolis can be sunk in Halkett Bay -- a divers' paradise that would be the wreck sunk closest to a big city in B.C.