"If you drain the Submarine Voyage lagoon, the Matterhorn will sink!"
I heard this rumor so many times...almost as often as people used to say that Space Mountain would be "adding a loop" when it was closed up through Disneyland's 50th I didn't really believe it, but I believe I also read something supporting the idea in Mouse Tales.
What I'm wondering about is this tidbit I read from an old article by David Koenig (who was the author of said book), which was written a while after the original Submarine Voyage was closed and the lagoon sat dormant without any plans:
Structural problems also plague the lagoon. The maintenance worker said, "The main reason the subs were closed was the fact that the tunnel was collapsing. In at least one place, the guide rails had broken free, and the repair costs were deemed too excessive. At least one sub had damaged its sail when traveling across this section. The water level in the lagoon has to be maintained to prevent a large sinkhole from collapsing underneath Innoventions, which would take out Autopia and Rocket Rods as well. Attempts to seal this hole have all failed, mostly due to the porous soil, so Disney pumps something like 50,000 gallons of water per day into this mess to keep things 'stable.' Each year, the amount of water necessary grows, and nothing can or will be done about it."
I do not wish to question David's credibility, but even the best sources can get bad information. Obviously nothing sank or collapsed when the lagoon was drained and work began on Finding Nemo: Submarine Voyage. However, I'm feeling somewhat inclined to believe that there is some truth to this story. Does anyone here know any more about this?