It was mentioned on the military channel. One of their top ten shows but I can't remember if it was on aircraft carriers or subs.
On the I-400 the narrator said it was used to launch a plane that dropped 2 incendiary bombs into the forests of Oregon.
The US was unaware of this action until after the war and we found records of it.
The largest submarines of World War II and remained the largest ever built until the construction of nuclear ballistic missile submarines in the 1960s. They were submarine aircraft carriers able to carry three Aichi M6A Seiran aircraft underwater to their destinations. They were designed to surface, launch their planes, then quickly dive again before they were discovered. They also carried torpedoes for close-range combat.
The I-400-class was designed with the range to travel anywhere in the world and return. A fleet of 18 boats was planned in 1942, and work started on the first in January 1943 at the Kure, Hiroshima arsenal. Within a year the plan was scaled back to five, of which only three (I-400 at Kure, and I-401 and I-402 at Sasebo) were completed.<<< Wiki,
I could find nothing about one hitting the west cost,and with only three completed i dont think we would see one even if there where sub's in game.