A fellow employee had been part of a P-3 crew in the USN when the plane first entered service. On patrols, it was a practice to stay on a USSR sub if one were detected. Ivan would try to get away and the USN would relay an aircraft to relieve the plane on the sub. The idea was to eventually catch the sub surfacing to recharge, replenish or what ever. When the Ivan would surface, if he didn't get away, the sub crew would pour onto deck, line up in best uniform, while P-3 made a low flyby taking pictures.