It's not the place people typically find themselves: under the Mackinac Bridge. If you are one of those people, you may find a hidden secret under the water all the way back from 1954. Photo by Anna King on Unsplash Green suspension bridge over bright blue waterMackinac Bridge's Submerged FootprintsChris Totten recently shared a video on Facebook of him floating in the water under the Mackinac Bridge, near the North Tower. There are thousands of crawlways and tunnels inside the bridge, so there's no telling how many other secrets are hidden inside the bridge. Constructing the Mackinac Bridge, 1954-1957