Lake Superior had many large islands in Robert Morden's 1698 map and John Senex' similar map of 1719. Even Guillaume de l'isle's map of 1718 showed an elevated plain.

Well-Preserved, 131-Year-Old Shipwreck Found in Lake Superior Researchers discovered the S.S. “Atlanta” last summer while using sonar to map 2,500 miles of the seabed ...

Two shipwrecks from 1914 found in depths of Lake Superior 00:24. Researchers searching for a pair of World War I-era minesweepers that mysteriously vanished in Lake Superior over a century ago ...