Asroc and Katie were two methods of introducing nuclear weapons to WWII-era warships. One was fairly well thought-out and had a long run in service during the Cold War. The other did not and is remarkable for how unusual it was.
(A nuclear RUR-5 Asroc detonates near the WWII aircraft carrier USS Yorktown (CV-10) during 1962.) (photo via Federation of American Scientists)
(Blueprints for the 1950s modification to the WWII Iowa class battleships to enable them to fire 16″ nuclear shells.) (photo via Battleship New Jersey Museum)