Japanese scouting before the battle was disorganized. A line of Japanese submarines was late getting into position. This let the American carriers reach their meeting point northeast of Midway (known as "Point Luck") without being found by the subs. A second attempt at scouting, using four-engine Kawanishi H8K flying boats to fly to Pearl Harbor prior to the battle and see whether the American carriers were there did not work out because Japanese subs could not refuel the planes. Japan did not know where the American carriers were before the battle.