Shipwrecks, mussels and sponges: Chicago has scuba diving history

On a cloudy, 80-degree summer day, I squeezed myself into a full-length rubber wetsuit, pulled a tight hood over my head and shimmied my hands into some thick gloves. Several miles away in Lake Michigan from our starting point in Hammond, Indiana, my fellow scuba divers sweated it out on the boat while waiting to plunge into the water. In Chicago, the 109-foot Silver Spray is the only shipwreck you can spot from DuSable Lake Shore Drive. The ship ran aground in 1914 at the Morgan Shoals, an…