[Lower Deck]

What is a “Dutch Breech?”

It's a section of the hull designed to be easily cut away to allow access to the machinery spaces. You see them on conventional submarines only. The shipyard will open the hull there to remove the diesels or what have you. Then it'll be welded shut again once the work is complete.

[null and void]

I’m guessing there is a similar provision for refueling a nuclear sub.

[BenLurkin]

Thank you!