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Great Lakes Shipwreck Preservation Society
Dedicated to Preserving our Shipwrecks and Maritime History
"From Prevention to Preservation"
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Website Updated

GLSPS Annual Fundraiser!!

UMSAT Show Website

Virtual Show Only!
The Date for the 2021 UMSAT Show!!

April 8 - 10, 2021

Thursday, 7:00 PM to 9:00 PM
Friday, 7:00 PM to 10:00 PM
Saturday, 1:00 pm to 5:00 PM

Meet and Greet  the speakers
Virtual Event 
starting Saturday at 5:30 PM and going to 7:30 PM

There will be one or two speakers each night 
starting at 7:00 PM

Saturday will have two speakers and a Virtual Social event 
starting at 5:30 PM and going to when ever.....

Stay tuned for the Lineup of Speakers for 2021

For more information on the upcoming 2021 UMSAT Show, please visit

If you are interested in joining the UMSAT Show Planning Committee, please email us at

Or, contact Mary Lillimo at "Show Chairperson", or Phil Kerber, "President", at

We are always looking for speakers that would like to present a great topic about their scuba diving or adventure travel experiences.

Please let us know if you, or anyone you know, would like to be a star and speak at a future UMSAT Show!

Lake Superior Magazine Logo 2x1
Check out the most beautiful magazine ever produced in Northern Minnesota!

GLSPS Project Sponsors

Air Down There Scuba offers free air fills and special pricing on rental equipment while participating in GLSPS projects. Required to show GLSPS Membership Card! 
Thank you, Scott and Tracy!

Aquaventure Dive and Photo Center offers free air fills and special pricing on rental equipment while participating in GLSPS projects. You will be required to show your GLSPS Membership Card.  They have also loaned us a GoPro HD video camera for a few projects. Thank you, Steve and Jolene!

Videos produced by Steve at Aquaventure Dive and Photo Center filmed in Lake Michigan on a Milwaukee charter trip. Click on their above logo for information to join them on a charter to visit these shipwrecks.
Prins Willem
The Dredge 906

HomeHesper Propeller Fluke PIB

Put It Back Report: Hesper Propeller Fluke

Steve Daniel, PIB Chairman
Chuck Morris and Don Maticek of the Owatonna Dive Club led an effort to return the broken propeller fluke from the Hesper to the shipwreck site in Lake Superior near Silver Bay, Minnesota.

Several years earlier, the broken blade had been recovered from the bottom of the reef that the ship hit during a storm prior to sinking. It was returned to an area within 100 feet of the wreck on November 29, 1997. Unfortunately, weather conditions prevented a closer placement. The dive club plans to move the blade closer to the stern and rudder so that more divers will be able to see it near the wreck.

Some interesting things about the blade were noticed while preparing to return it. The broken blade is estimated to weigh 1200 pounds, and its size is about 3.5 feet wide by 5 feet long. The blade was broken off near the shaft. Furthermore, the number 17 is debossed on one side of the narrow end of the blade. There are a few deep grooves sculpted into the other side of the blade at the narrow end. Presumably, these were used for tightening the bolts that attached the propeller to the drive shaft. There is also a one inch diameter hole near one edge at the wide end of the blade. Perhaps, this is for positioning the fluke near the drive shaft for attachment or removal.

The PIB 0003 number was stamped in the blade on the side with the grooves, as this will be the side that will be exposed when the it is returned to the shipwreck site. The original location of the broken propeller fluke and where it will be relocated upon its return to the site was noted in documentation sent to Scott Anfinson of the Minnesota State Historical Society. The GLSPS appreciates the interest and generous assistance of the Owatonna Dive Club. We all look forward to seeing this large artifact when we dive the Hesper in the future.