 The problem with the concrete is rumored to have occurred due to a glitch in the 4-D scheduling software that prevented adequate curing of a portion of the Yeti's foundation before the fabrication of mountain elements and roller coaster track.Joe Rohde, the Imagineer in charge of building the attraction and Animal Kingdom, was asked about the yeti at the 2013 D23 Expo.Rohde responded, "You have to understand, it's a giant complicated machine sitting on top of, like, a 46-foot tall tower in the middle of a finished building.