As a Luther student in the 1970s, Mike Osterholm was an adventurous sort, scuba diving in the underwater caves of Northeast Iowa. Mike and his friends plunged under cliffs and sumps, and swam through murky tunnels to emerge in caverns filled with stalactites and stalagmites. “Some of those spots were so tight,” he says, “you’d breathe in and get stuck, then breathe out and push yourself forward.”