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Great Lakes Shipwreck Preservation Society
Dedicated to Saving our Shipwrecks "From Prevention to Preservation"
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GLSPS Annual Fundraiser!!

UMSAT Show Website

The 2020 UMSAT Show has been CANCELED because of the Corona-virus Outbreak

The New 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 12:00 AM

Stay tuned for the Lineup of Speakers for 2021

For more information on the canceled 2020 UMSAT show, and 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!

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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 Monitoring & Survey Project 2018

2018 GLSPS Pretoria Monitoring Project

August 2 - 6, 2018


The Crew of the 2018 Pretoria Monitoring Project
(L to R: Jack D., Tim P., Jim C., Phil K., Mike M., Corey D.)

The Pretoria Donkey Boiler is Still Secure
Used as our mooring line for the Project 


Click Here for more photos of the Project

Closing Report:

With the heavy work of lifting and securing the boiler having been done in the previous two years, we went back this year to monitor how well the boiler remained secured to the bottom.  Other goals for this year’s project were to search for the firebox door, return it to the boiler, locate the mooring block and put a chain on it for mooring, and search for other sections of the wreck that have not been documented.  


The Project crew included the familiar faces of Tim Pranke, Phil Kerber, Jim Christenson, Corey Daniel, and Jack Decker.  New comer Mike Mack joined us.  The proper permits for diving on this historic wreck were procured through the Wisconsin Historical Society (WHS) back in April.  The Float Plan was filed with Silver Bay Marina just prior to departure.


The R/V Preservation cruised out of Silver Bay Marina Thursday morning, August 2, on an Easterly heading across Lake Superior to Outer Island.  The Pretoria lies about a mile and a half North of Outer Island and just outside of the Apostle Islands National Lakeshore boundary (hence the permit from the WHS.)  We arrived at the wreck and splashed the first divers at about 4:00 PM.


The boiler was still attached to the bottom.  The chains were as tight as when we put them on, last summer.


Dives the second day found the mooring block and chocks.  The chocks are from a previous attempt (by other divers) to secure the boiler.  A chain was secured around the mooring block for future mooring.


On the third day, Saturday, August 4, divers found the firebox door, at the edge of the wreck near the mooring block, and moved it to the boiler.  It was test fit to the boiler to verify it was indeed the firebox door.  It fit, but, was a bit flattened.  Most likely, the flattening came from being rolled on by the boiler, while still attached to the boiler.


Dives the fourth day searched west and north of the stern.  Some scratch marks on the bottom indicated wreckage might have been pushed this way.   A measurement was taken of the length of the undocumented section of the port hull section north of the wreck.  Based on scaled dimensions from the official documented drawings, this measurement, and knowing the actual length of the ship, an 80 foot (approximately) section of the ship is still missing.


The final day, Sunday, August 5, was the only day we were weathered off the wreck, by an approaching thunderstorm.  We cruised the R/V Preservation around the NE corner of Outer Island to a very scenic and rocky shore, out of the weather. The water was clear and coldly inviting.  So, we went swimming.  The storm had moved on after lunch and diving on the wreck commenced.  The dives were spent searching north and west of the stern for other missing sections.  In the process, Tim found what we believe to be part of the hydraulic steering mechanism.


In all, we performed 27 dives for a total of over 24 hours of dive time.  The weather was terrific, as we were able to stay every night at Outer Island Lighthouse.  A campfire one night and beautiful stars every night.  The securement is holding, the firebox door returned to the boiler and more wreck is still to be found and documented.


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