The green wall caused a huge amount of confusion last year when we were looking at the whole Fungus Forest / FP connection >_>
I'm going to see if there are any cutscene digits for the machine room, that could be very interesting... If the doors do ever, indeed, open, this MIGHT be able to find it, although I'm still not sure whether cutscenes appearing AFTER the SnS activator will simply cause the cutscene mod to freeze, like a freeze digit... I'll try and figure that out tomorrow...