A fellow in the Explorer’s Club, Kohler is an author and shipwreck explorer with 40 years of diving experience. He discovered lost ships such as the Andrea Doria, RMS Titanic, USS Murphy, USS Lagarto, U-215 and U-869. His explorations were detailed in documentary films, television programmes (he hosted 56 episodes of “Deep Sea Detectives” on History Channel) and a NY Times best-selling book, Shadow Divers, by Robert Kurson. In 2017, his first book Mystery of the Last Olympian, detailing his work on the HMHS Britannic, was published.