Strategic mistakes at Pearl Harbor

[twyacht]

I was always interested in the Japanese submarines that were dispatched for the Pearl Harbor attack. 

http://www.ww2pacific.com/japsubs.html

"Most of the submarines departed from JAPAN for a rendezvous at KWAJALEIN, to proceed thence to HAWAII. A few, which were delayed in leaving JAPAN, changed course and proceeded directly to HAWAII.
The submarines continued operations in the vicinity of HAWAII from 8 December, the day of the attack, until early January of the following year. During this time, most of the submarines proceeded to the west coast of the UNITED STATES to destroy shipping, and part of the submarines returned to JAPAN. Only a small number remained in the Hawaiian area for the maximum length of time.

"The Japanese submarine detachment belonged to the Sixth Fleet, whose flagship was the light cruiser Katori. In early November orders for war preparation were given to this detachment, and on 11 November over ten submarines of the First and 3rd Detachments, including "I" Nos. 69, 74, 75 and others left Yokosuka Naval Base, with knowledge of the growing war fever in Washington and Tokyo.

"The submarine fleet followed a course due east in line ahead, stretching over 20 miles. They navigated at surface speeds of from 12 or 13 to 20 knots. But when they got near the Hawaiian waters they extended and followed their respective courses. The duties of the submarine fleet were known as

    (a) to feel the movements of American fleets around Pearl Harbor;
    (b) to dispatch "special submarines" from their decks and to observe their war results;
    (c) to attack escaping American war vessels, if any;
    (d) to rescue operators of "special submarines", down fliers, and others wherever possible.

07Dec41: Pearl Harbor Attacked
    00:42 to 03:33. Five mini-subs launched for Pearl Harbor.
    03:42. Mini-sub sighted by coastal minesweeper Condor (AMC-14)
    04:04. Ward investigates Condor sighting.
    06:30. Antares (AKS-14) sights suspicious object, possibly a small submarine. Patrol ship Ward (DD-139) notified.
    06:33. Navy patrol plane circles and drops two smoke pots.
    06:37. Ward sees conning tower between Antares (AKS-14) and her tow, apparently headed for Pearl Harbor.
    06:45. Ward fires on mini-sub with a hit, attempts to ram, depth charges and sinks it.
    07:30. Ward echo-ranging latched on to another one, dropping depth charges but did not come up with concrete results.
    08:02. Minisub from I-16 may have torpedoed West Virginia and Oklahoma.
    08:33. Report of Japanese submarine in harbor channel. (minisub from I-22)
    08:37. Monaghan (DD-354) orders "all engines ahead flank speed" to ram submarine.
    08:40. Submarine observed to fire one torpedo up North Channel toward Curtiss (AV-4).
    08:40. Conning tower hit by 5" shell from Curtiss (AV-4), 4" from Perry (DMS-16) or 3" from Medusa (AR-1).
    08:44. Monaghan feels a slight shock and releases two depth charges; submarine rolls over.
    08:55. Submarine reported sighted in North Channel.
    08:20. Helm (DD-388) opened fire on submarine off Tripod Reef. No hits observed.
    10:04. St. Louis (CL-49) exiting the channel when two torpedoes approached. Just before striking the ship, they hit a reef and explode. [Who fired, I-16 mini?]
    11:27 Cummings (DD-365) made depth charge attacks.
    11:33 Breese (DM-18) traced a submarine, dropped 5 depth charges.
    11:39 Cummings (DD-365) made depth charge attack on a second contact.
    12:04 Gamble (DM-15) established sound contact with submarine and dropped three depth charges.
    Chew (DD-106) reports 28 depth charges dropped on eight different sonic contacts south-west of entrance buoy. Evidence indicated that two submarines were sunk.
    Blue (DD-387) One submarine either sunk or severely damaged by depth charging 4 miles from Diamond Head Light.