I've been on a couple of WWII subs. They look really large in pictures and diagrams but once you go inside it is really hard to get your head around the idea of 35 men on board.
Close quarters indeed.
I had to pause for a second and wonder if I read this right...."Whole of Cockpit Cover along with the Pilots Head..... "
Oh, it's "...Head Armor...."
Never really heard the phrase head armor before.