a team of oceanographers and marine archaeologists from austin just finished a two-week project in lake huron's national marine sanctuary. they used a purpose built autonomous underwater sonar to scan southeast of 'wreck alley' looking for both undiscovered shipwrecks and possible prehistoric shoreline settlements. very cool! we can expect some interesting finds once all the data is analyzed.
http://oceanexplorer.noaa.gov/explorations/10thunderbay/welcome.html
http://oceanexplorer.noaa.gov/explorations/10thunderbay/welcome.html