So it looks like this is fixable. The pool structure/cement specialist came by yesterday and said that the bad section could be cut out and the minor cracking could be filled in with epoxy or epoxy based cement.(not sure what he meant)
So it looks like the red portion gets cut out, new rebar, cement and a membrane on the outer portion.
I was thinking that after this, I would use a sealant on the whole pool called, "sani tred".
The rusted tube up the side wasn't attached to anything in the end, so that's not an issue and we did find the drain which seems functional and clear. I believe it's galvanised pipe because the section that sticks out up top looks grey and not very rusted. (I know that we'll need to pressure test this none the less)
So I'll get a price for the new section of cement and if it's not too much, we'll continue on with the restoration of the pool.
Has anyone here used Sani tred?
Thanks,
Bruce