Probably the best chance for rebuildable airframes is in any of the many freshwater lakes in the US & Canada. Apart from the Great Lakes, Lake Washington would probably be one of the most promising - apart from its proximity to Boeing (one of the first Lazy B seaplanes was lost "under the log booms at Renton") - it's been used as a seaplane base while Sandy Point was a major USN training base. Water temperature at the bottom of all of them is close to freezing with very little oxygen and no shipworm so preservation should be good.
Last edited by ICT_SLB; 26th Jan 2013 at 02:33.