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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

If we are allowed to have a physical Show
The Date and Venue for 2021 UMSAT Show!!

April 9 - 10, 2021

Friday Night at the Movies
7:00 to 10:00 PM

Saturday, 9:00 AM to 6:00 PM
Main Show

(Meet and Greet Party with Food and Beverages)
At The Holiday Inn Hospitality Room
(Next Door to Jimmy's)
7:00 PM to 11:00 PM


If we have a Virtual Show Only
The dates would be

April 6 - 10, 2021

There will be one speaker each night 
starting at 7:00 PM

Saturday will have two speakers and
the GLSPS Awards Event 
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

Here are the Links to Important Exhibitors Documents
  UMSAT Booth Table Layout at Jimmy's Event Center

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

HomePretoria Boiler Securement Project 2017

Pretoria Boiler Securement Project 2017


Click Here to see more photos of the 2017 Project

This year, the GLSPS once again sponsored a Project in the Apostle Islands to support the Wisconsin Historical Society in keeping the Pretoria Shipwreck's Boiler near its wreckage. 

Selected active members of the GLSPS cruised the RV Preservation research vessel from Silver Bay Marina to Outer Island of the Apostle Islands.  This was a continued project from 2016 when the GLSPS lifted and moved the boiler 300 feet back to the shipwreck.  This year 2017, we needed to secure the boiler. 

The boiler was attached to the bottom of the lake or near by the Pretoria Shipwreck by drilling eight holes into the bottom of the lake which is sandstone.  We then used pinch bolts and epoxy to attached four 1/4 inch thick plates with two holes in each.  We then attached a chain to each bolted-in plate and attached it to the boiler.  This will provide four attachment points to the boiler to help prevent the boiler from moving around in the future.

Both the 2016 and 2017 Projects were intense projects with many hours of planning for this type of underwater construction project.  Many hours and days were spent to locate equipment, design and build the underwater parts to secure the very large and heavy object.  The Pretoria Project was a very hard project for the GLSPS and Participants and we thank them for all their hard work, especially Tim Pranke and Jack Decker, which shared the Project Leaders position.  Without their support and commitment to the project, it would not have taken place or be as successful as it was.

A special thanks goes out to both Jay Hanson and Phil Kerber for their use for the commercial dive equipment and rigging.  Ken Knutson for his expertise and on-board consulting on underwater construction and rigging advice.

The project was a success!  We still have a few things to do on the wreck and are planning another 2018 Pretoria Project.  Please check back to see what is next.  We will be opening the project up to other GLSPS Members.  Please check the 2018 Project Schedule for more details and registration requirements.

For more information please contact us at

Jack Decker
Pretoria Project Leader

Tim Pranke
Pretoria Project Co - Leader

Phil Kerber
Captain - RV Preservation Research Vessel