What’s less well known is that the Japanese planned and executed a less successful follow-up mission that was meant to thwart salvage operations and further disrupt the US Navy’s Pacific Fleet. However, operational issues meant only two flying boats were available for the mission. The first strike on Pearl Harbor had been viewed as a tremendous success by the Imperial Japanese Navy (IJN), but subsequent reconnaissance missions had confirmed that the US Navy’s salvage efforts were progressing at a rapid pace.