 At Kwajalein, five submarines were selected to participate in Operation K-1, the planned second air attack on Pearl Harbor.The objective of the attack was to bomb the "Ten-Ten Dock" and disrupt ship repair activities.The plan called for the airplanes to depart from the Marshall Islands and fly to French Frigate Shoal in the Hawaiian Islands (500 miles WNW of Pearl Harbor) where they were to be refueled by I-class submarines.