A Fuddy mannequin in a too-short coffin and duplicate airplanes and ninja frogmen with an underwater mechanic shop is indeed lunacy.
Or nuttery, if you prefer.
Making up fan-fiction about that which is unknown is not research.
It’s crap, is all.
It’s clear you’re not of a mind to familiarize yourself with your drive-by gunning target that you would neutralize, but FYI, there is no mention of a coffin or duplicate airplanes in the book.
Wasted lead.