80 years- Pearl Harbor
28 Nov, 1941

Oahu, Hawaiian Islands:

The USS Enterprise slips out of Pearl Harbor with its escort ships, forming Task Force 8.

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TF 8 was ordered by Kimmel to deliver a dozen fighters from Marine fighter squadron VMF 211 to reinforce the squadron's fighters already operating on Wake Island.
The carrier USS Lexington is to deliver additional Marine Corps fighter planes to Midway and leave Pearl on Dec 5, the day before the Enterprise returns on Dec 6. This rotation by Kimmel keeps at least one carrier in Hawaiian waters at all times.
The third and final American carrier assigned to the Pacific fleet, the Saratoga, is in San Diego undergoing a refit.

President Roosevelt ordered the Pacific Fleet's main base moved from San Diego to Pearl the previous year. It was a point of contention by some Navy brass.
The base, though much closer to Japan it made for logistic challenges.

Aside from a 2,000 mile supply line of shipping required from the west coast, the harbor itself was cramped.
However, cramped Pearl had an advantage that the spacy Lahina anchorage area did not. Pearl was at most 35 feet deep--too shallow for air-dropped torpedos to work. As a result, their noses would plummet into the mud before leveling off.
No anti-torpedo netting along the ships would thus be needed.

Besides, the base command thought the netting impeded the already cramped sailing lanes in the harbor.
2600 nautical miles NW of Oahu:

Kido Butai presses on with weather reports broadcasts from Tokyo discussing patterns in all areas of East Asia and the Pacific. A low-pressure system may develop in a week in the north-central Pacific.
It will be a challenge sailing through it with only visual signals.
However, it could help shield the Mobile Fleet from the Americans.

Onboard the six carriers is a vast armory of aerial torpedos that will be dropped by torpedo bomber aircraft in the planned raid.
These torpedos can be fitted with wooden fins. When attached, the fins are designed to immediately shallow the torpedo's dive before hitting Pearl's bottom when dropped from the correct height.

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More from @history_dame

29 Nov
80 years—Pearl Harbor
Nov 29, 1941

Oahu, Hawaiian Island National Territories:

The cramped ship space of Pearl was not the only Naval knot in the stomachs of Hawaii's U.S. command.

The harbor was surrounded by heights from which anyone on a public road could view.

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And it was a lovely sight of the expanse of Oahu-- to the east, Diamond Head mountain overlooking Waikiki Beach and Honolulu, and to the west wall of the lochs of Pearl, whose mouth opened to the sea on the south edge of Oahu.

Since March, Takeo Yoshikawa has enjoyed the view
Under the cloak of having diplomatic papers as a vice-consulate and with an alias name, Yoshikawa is an IJN intelligence officer monitoring the coming and goings of U.S. aircraft and ships at Pearl and all Oahu.

Twice weekly, he sends reports through diplomatic codes to Tokyo.
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80 years- Pearl Harbor
27 Nov 1941
Washington DC:

United States code breakers have been intercepting portions of Japanese diplomatic and military communications issued by the Japanese government through its chain of command.

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The communique decoded imply negotiations with the United States are failing and that after November 30, "things are automatically going to happen."
With other intelligence and locating significant movement, this news caused the Joint Chiefs to issue a notification to Admiral Kimmel and General Walter Short, commander of all Army forces in Hawaii.
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