White Fish Point

Lake Superior is the largest freshwater lake on Earth by surface area, but it behaves more like a massive, ancient inland sea. Because its deep waters maintain a near-freezing average temperature of 34 degrees, biological decomposition nearly stops entirely. This grim biological reality backs up the famous folklore that the lake never gives up its dead. In Episode 14 of The Evening Fog, we dive into the freezing darkness off Whitefish Point, a treacherous bottleneck famously known as the Graveyard of the Great Lakes. We explore how modern side-scan sonar and autonomous underwater vehicles (AUVs) have ushered in a golden age of shipwreck hunting, successfully closing decades-old cold cases like the Western Reserve and the Arlington. However, this same cutting-edge technology is also picking up anomalies that shouldn't exist. From the crew of the research vessel Marram experiencing unexplainable 11-degree temperature spikes and chilling audio dropouts over a wreck, to phantom sonar signals that perfectly mimic ship hulls before vanishing into flat silt, this episode investigates the unexplained. Are these just acoustic flukes caused by the lake's unique water chemistry, or has something in the deep learned how to sound exactly like what the sonar is looking for?