Category Archives: SCUBA

We’ve acquired a new Trident ROV

We’ve recently acquired an OpenROV Trident underwater ROV and have been putting it through it’s paces over the last few weeks.  This is a fantastic addition to our drone collection and will be used in conjunction with our work with Maritime Heritage Minnesota, a marine archeology firm with which we have had a 10+ year relationship.

The link below is our first video shot with Trident on a local shipwreck in Lake Minnetonka.

End of another diving season

Last Saturday I made my last SCUBA dive of the season.  The lakes are beginning to ice over — so I’ll have to wait until my Florida trip in February to start the new season.

Stats for the year:

  • 78 dives completed in 2017
  • 13 new wrecks discovered or explored, including the SS Liberty in Lake Superior at Grand Marais and wrecks in Lake Minnetonka, Lake Pulaski, and Prior Lake
  • Completed my 10th year volunteering as a diver with Maritime Heritage Minnesota, a local marine archeology firm

But maybe the highlight of the year was my discovery of a new wreck in St. Louis Bay in Lake Minnetonka during my last few dives of the year (photo above).  I was able to excavate and video portions of this wreck, with the remaining work to be conducted next year.

End of another diving season

model-t 1932 Ford Deluxe Roadster. (07/24/2007)

The end of another diving season is here.  I made my last dive for the season last weekend in 35 degree water in Lake Minnetonka.  It’s a shame to end the season as I had 35 foot visibility!

It was another year of exploration and discovery with Maritime Heritage Minnesota, where I have been a volunteer for the past 9 years.  We continue to dive on anomalies that were discovered during their side scan sonar survey of Lake Minnetonka from a couple of years ago.

My personal stats for the year:

  • 87 dives completed
  • 9 shipwrecks including the passenger vessel White Bear in Lake Minnetonka and the Fleetwing in Lake Michigan (Door County)
  • 2 antique cars — the body from a Ford Model T touring car and a 1938 Ford Deluxe Roadster
  • Water intakes, pipelines, and other artifacts in Lake Minnetonka

Most of these finds have been  documented via video — search for my YouTube channel (K7ALE) to take a look.



Navdive for research

I’ve been a volunteer diver for a number of years at Maritime Heritage Minnesota (MHM), a marine archeology firm here in the Twin Cities doing underwater survey work in the state,  Over the past few years, we have been working at Lake Minnetonka to search for sunken wrecks and determine what they are and how they got on the bottom.

We’ve used Navdive (our GPS-based navigation system for divers) on many of our survey dives, including yesterday when we spotted a possible wreck on our surface-based side scan sonar in the dive boat.

NavDive unit

With Navdive, we were able to:

  1. Preprogram GPS coordinates that were obtained using the side scan sonar on the boat, allowing the diver to navigate to each point while remaining underwater.

Sonar image

2.  Capture GPS coordinates of underwater features that are discovered during the dive for cataloging later.

3. During the post dive analysis, we were able to show the path our divers swam during the entire dive.

NavDIve dive trace

The results?  More efficient use of our underwater time, better data for our research, and the ability to integrate all of our data sources (i.e. surface-based side scan sonar, Navdive data, and Google Earth) to produce reports documenting our findings.

For more info on Navdive, see our web site here.

Almost a record ice out

First dive for 2016 in Lake Minnetonka today.


The ice went out in the middle of last week — almost an all time record for the earliest ice out in this Minnesota lake.  I did have to dive in Wayzata Bay today — St. Louis Bay was still covered in ice.

Water temp was right at 32 degrees, but great visibility.

The season has started!

End of a great season


Normally, my diving season would have ended over a month ago, but because of our late “ice in”, I have been able to dive in Minnesota into December — 35 degree water, but at least there was no ice.

The numbers for 2015:

  • 112 dives completed
  • I was able to dive on 14 new wrecks, including the following passenger vessels on the bottom in  Lake Minnetonka:
    • Saucy Kate
    • Hopkins
    • Como
    • Hercules
    • Excelsior (shown above)
  • 1 car
  • 1 snowmobile

My thanks to Maritime Heritage Minnesota for allowing me to make many of these dives as part of their research.  I’ve learned quite a bit about underwater archeology and, in particular, the history of Lake Minnetonka and its rich maritime past.

Many of these dives were documented by video — search for the K7ALE channel on YouTube.

Looking forward to 2016.

New season starts with Maritime Heritage Minnesota

Yesterday marked the start of my eighth year as a volunteer diver for Maritime Heritage Minnesota, a non-profit involved with the research, exploration, and documentation of Minnesota’s underwater resources.


We spent the day yesterday on Lake Minnetonka diving on three different “anomalies” that were discovered during MHM’s side scan sonar study.  The first anomaly proved to be elusive and after two dives, we didn’t find anything.  So we moved over to anomaly two and found a small fiberglass runabout (1970’s vintage).  The third site we dove on looked promising on the sonar, but turned out to be a very long log sitting next to a metal trailer frame.

Always interesting and always a lot of fun. LM8

Wreck hunting with openROV

David Lang, co-founder of openROV ( and I had a chance to get out on Lake Minnetonka yesterday to do a little wreck hunting.  I’m very interested in how ROVs can help make the survey work we are doing with Maritime Heritage Minnesota more efficient (as compared to deploying divers to investigate every anomaly).


I was impressed by this little ROV’s capability and I believe it can be used in a number of ways — quick investigations of anomalies,  video/photo documentation, and diver support during survey dives. Very cool!

Marine archaeology update

For the fifth summer in a row, I have been volunteering with Maritime Heritage Minnesota, a non-profit marine archaeology firm researching Minnesota’s submerged resources.  This summer, we have continued our work in Lake Minnetonka, diving on sites that have been identified during a previous side-scan sonar survey of the lake.

So far this year, I have been able to dive on five wrecks, including a new discovery.  I have video of all of these wrecks on YouTube (search for K7ALE for my channel) — I am also linking to a couple of the more interesting videos here.