As I suspected, the wallpaper was glued directly to unfinished drywall. This is my third house and the seventh room I've removed wallpaper from. In the past, I have tried every wallpaper removal technique known to man, but I still hope to find the magic bullet one of these days. I saw a product on an HGTV show awhile ago that looked promising: WallWik Simple Strip.
The kit consists of a pressurized sprayer, adhesive remover, paper tiger (device that perforates the paper with tiny holes), plastic skimmer (to scrape the paper off), and special reusable fabric sheets. The wallpaper is scored lightly with the paper tiger, and then the fabric sheets are soaked in the adhesive remover and layered on the wall. The wall is periodically resprayed so that it stays very wet. Theoretically, in about 30-40 minutes, the wallpaper is supposed to peel off in sheets, with little to no effort.
In fact, saturating the paper so much was probably worse in my case because some of the drywall paper peeled off, too.
I am not panicked because My Man is used to fixing my faults and because we are going to do a spray-on orange peel texture anyway (to match the rest of the walls in my house, not because I'm enamored with it). And orange peel covers a multitude of sins.
By the way, speaking of My Man, he made me a nice, sturdy base to cover the tub so that I could reach to the top of those 10 foot tall walls:
I felt secure on this even with my somewhat wobbly 8 foot wooden ladder.
The next steps to this project are to patch, prime, and texture. I hope you come back to check on our progress!