Some of you know Michael Lowrey as the keeper of the annual By The Numbers report on city and county tax burdens. Others know him as the man who chronicles major decisions from North Carolina’s appellate courts. Others know him as a watcher of air travel changes in the state, and a few of you might remember that he also has focused some attention on the future of NASA.

Michael is also a U-boat aficionado, and he’s just released fascinating new information on that topic.