 The plan called for Port Moresby to be invaded from the sea and secured by 10 May.The plan also included the seizure of Tulagi on 2–3 May, where the navy would establish a seaplane base for potential air operations against Allied territories and forces in the South Pacific and to provide a base for reconnaissance aircraft.Upon the completion of "Mo", the navy planned to initiate Operation RY, using ships released from "Mo", to seize Nauru and Ocean Island for their phosphate deposits on 15 May.