At 6:22 p.m. on November 23 1953, an F-89 Scorpion jet was scrambled from Kinross Air Force Base near the Michigan Soo to intercept an unidentified object detected in restricted airspace over the Soo Locks.
The U.S. fighter was seen on radar over Lake Superior, merging with the craft it was pursuing.
Then, it disappeared from radar.
Never to be seen again.
Ever since, the UFO-theorist circles have been speculating what might have happened.
In October 1968, the Sault Star reported that aircraft parts believed to have come from a "high-performance military jet aircraft" had been discovered by prospectors on Lake Superior's Canadian side.
Today, the UFO circles have started buzzing again, with speculation that this side-scan sonar image (reproduced by SooToday.com with permission from the Great Lakes Dive Co.) might be the missing F-89 Scorpion.
The dive company's website indicates it's currently involved in a forensic investigation of the Canadian wreck site.
A company map shows the search area as being in Ontario waters off the tip of Michigan's Keweenaw Peninsula.
The dive company also intriguingly indicates that its sonar detected another "interesting" object near the sunken aircraft, that might be part of whatever it was that the jet was pursuing.
To visit the website of the Great Lakes Dive Co., please click here.
To read more about today's speculation and to access some primary source documents from the U.S government, please click on the following: