Beneath the waters of the Great Lakes, thousands of shipwrecks, hulking carcasses of a bygone era, have been hiding for generations, just waiting to be revealed. Once someone stumbles upon one of these sunken treasures in Lake Michigan or Lake Superior, Tamara Thomsen gets a call.

Thomsen is a maritime archaeologist with the Wisconsin Historical Society’s Maritime Preservation and Archaeology program. Her job is to investigate and survey shipwreck sites. Over the years, Thomsen has added some of these ships to the ​​National Register of Historic Places. And she and her colleagues have also unearthed dugout canoes that were fashioned thousands of years old by the Indigenous people who lived on this land.

In this episode, host Ari Daniel speaks with Thomsen about how she took up this profession, why she views shipwrecks as time capsules, why so many vessels met their watery grave on the Great Lakes, and how one stays warm at depth when diving for these wrecks for hours at a time.

To subscribe to “There’s More to That,” and to listen to past episodes about the S.S. Edmund Fitzgerald, the return of a set of important belongings to the Lakota community and a baseball field resurrected in a World War II-era Japanese internment camp, find us on Apple Podcasts, Spotify, iHeartRadio or wherever you get your podcasts.

“There’s More to That” is a production of Smithsonian magazine and PRX Productions. 

From the magazine, our team is Ari Daniel, Debra Rosenberg and Brian Wolly. From PRX, our team is Ali Budner, Cleo Levin, Genevieve Sponsler, Sandra Lopez-Monsalve and Edwin Ochoa. The executive producer of PRX Productions is Jocelyn Gonzales.

Fact-checking by Stephanie Abramson.

Episode artwork by Emily Lankiewicz. Illustration by Emily Lankiewicz / Images by Zach Whitrock / Wisconsin Historical Society and public domain.