Pearl Harbor Timeline:

0342 - Minesweeper CONDOR sights periscope off Honolulu Harbour ...notifies patrol destroyer WARD to investigate. 0458 Minesweeper CROSSBILL and CONDOR enter Pearl Harbor... defective submarine net remains open.
0600 - 200 miles south of Oahu carrier ENTERPRISE launches 18 aircraft to scout ahead...then to land at Ford Island, Pearl Harbor...ETA 0800.
0610 - 220 miles north of Oahu Admiral Nagumo orders launching of 1st wave of 183 aircraft off three carriers...2 are lost during takeoff.
0630 Destroyer WARD again notified of submarine sighting this time by supply ship ANTARES off Pearl Harbor entrance...Navy patrol plane (PBY) dispatched to the scene.
0645 WARD opens fire on target hitting conning tower...as she closes in drops depth charges..air attack by PBY follows.