Originally posted by mktiggerman
the floor and sidewalls of the 20k lagoon are eroding and falling apart from years of slack maintenance. If the lagoon were to be drained, the sidewalls would collapse (the water supports them) causing a major collapse into the tunnel (mainly to the locker rooms, costuming, and cash control). If they were to put ride vehicles back in, the ground would collapse into the tunnel, flooding it. Honestly, I don't foresee anything being done w/ this area, and any repair would more than likely mean closing off the entire back half of MK that is above the tunnel.
this is what I've been told by Fantasyland Management, and Maintenance Management, which I 've confirmed through my neighbors which are Imagineers.
Also, to add evidence to this, last year, the character festival had to be closed for approx 10 days because a rock collapsed into the tunnel and caused flooding in the female locker room.