Why not contact the Western Canada Aviation Museum in Winnipeg? - they have located and plan to salvage the "Ghost of Charron Lake" - the Fokker Standard Universal that sank there in the 30s. They used side-scan sonar to locate it, but it took them a long time. Someone there might give you a contact for one of their experts on underwater recovery. They have recovered other aircraft from lakes as well.
Meanwhile, a magnetometer drag seems like the simplest and most direct way of finding a big lump of metal under water.
Here's their link: http://www.wcam.mb.ca/
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