I ripped out the rest of that nasty old particle board in there and you can see one of the gas tanks sitting there. Luckily I was able to do this in a big rectangle, so I plan on getting a good piece of plywood to go there as the new sub floor and I'll be good to go! Most of the original sub floor is in good shape luckily. But for whatever reason an owner before screwed in a bunch of press board right on top of it and put the grey carpet over that. So the floors felt extremely solid, but it made the lower cabinet doors and bathroom door almost impossible to open since by doing that the floor was raised about an inch. Luckily I've pulled all if that out too though, because it was pretty moldy.