Japan attacks Pearl Harbor but flattens the repair yards and the oil storage yards.
The bomb weight the six carriers could deliver, even expending everything in three rounds of sorties was not remotely enough to 'flatten' the support facilities. Yes there would dry dock gates to repair, fuel tanks to rebuild, sunken cargo ships and a destroyer or two to remove from the harbor bottom, but even a maximum effort is not going to put PH out of action for six months or even three.Then there is the Japanese losses, a single round of sorties resulted in a permanent loss of 28 aircraft. Two attacks is liable to see that up 50% vs a alerted defense, so 70+ aircraft permanetly lost & at least half of the irreplaceable pilots. Since the Japanese did not think in terms of attrition warfare against support facilities the strike is liable to expend a lot of bombs on operational targets, like the airfields and any ships in the harbor. Plus Nagumo & his staff are unlikely to consider a second strike against what they see as a empty target area as worthwhile.
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