Master Bathroom Remodel: What lurked under the vinyl flooring.

Arrgghhh. This is the part that is fun+horrifying. After removing the cabinet and toilet, and pulling up 2 layers of vinyl flooring, this is what we see. I'm not actually too surprised, the other bathroom also had some significant mold problems in the floor. Note to myself: don't even ever THINK about using particle board in bathroom or kitchen flooring. It composts in there! Actually, once this layer of particle board was removed, under it was another layer of linoleum flooring which appears undamaged. I will need to replace the drywall and subfloor anyway - as with the first bathroom, the entire subfloor down to the joist will be replaced with outdoor grade plywood then layers of polyethylene to seal, then backerboard, dryset, and tile. All of the drywall will be replaced as well, since the room will be reconfigured and only a fraction of the original walls will remain in place and that fraction will have to be pulled out for new wiring and plumbing.