GrauGeist
Generalfeldmarschall zur Luftschiff Abteilung
The I-400 sub was the largest, most advanced sub in the world until it was eclipsed by nuclear attack submarines nearly two decades later. While it may seem that it didn't contribute much, it held a great deal of potential. As with most Axis hardware, the Japanese were too late getting these into service and with their limitations in production, weren't able to make enough in order to effect a wholesale strike.Yes, i read up on them a couple of years back. The amount of engineering and modifications they had to do im not sure the plan was even worth putting into practice, what with it diverting a lot of resources at a time when the Japanese really couldnt afford to partake in flights of fancy. The aircraft had backward rotating wings to fit into the sub. And they had to develope a way of heating the engine oil on the Aichi so it could take off as soon as it rolled out. Obviously running the engine in the hanger/designated area was both dangerous and outside too slow. I think it was ahead of its time in some aspects but totally flawed in others. A good idea but simply not practical. The chances of sneaking up on the US coast and carrying out what in effect would be nothing more than a bee sting to the Americans was i think highly unlikely and open to attack/disaster.
However, they could have just as easily conducted psych attacks on U.S. west coast facilities, like the refineries in Santa Barbara (Atwood, in particular) or in San Pedro/Wilmington that would have had a serious effect on public morale as well as hampered oil production/delivery.