I-25 was the sub that launched the aircraft that 'fire-bombed' Oregon. Considerably smaller than the I-400s.
Ah, thanks for looking that up.  Thought it was the I-400 type, but that just goes to show that CRS is starting to set in.  Got the state 
and the sub wrong. 

It was definitely I-400 types in the Cussler novel, so I guess that's what mixed me up. 
