[throwawaylinux]

Obviously not the pressure hull, just sheeting. Probably got wiring, pluming, ventilation, insulation and expansion over probably insulation/expansion wiring and insulation and expansion joint under there before the real hull.

Found a photo looks like you can see the other side.

https://eu-images.contentstack.com/v3/assets/blt949ea8e16e46...

And you can't really tell what fasteners are being used either. It could be screwed straight in the side like it's drywall, but it could be something slightly more reasonable.

It's not a contraption I would set foot in, but they reached the Titanic multiple times with it. That can not be done with screw your TV into the pressure hull level stupidity.

EDIT: And the pressure hull is 5 inches thick. That thing looks about a half inch.