the original location was moved slightly after a sinkhole formed. The tower's interior and exterior design took inspiration from existing Southern California landmarks, including the Biltmore Hotel and Mission Inn. The distinctive Spanish Colonial Revival architectural features that are present on and around the attraction's roof were designed so that the rear facade would blend with the skyline of the Morocco Pavilion at Epcot, which is located less than two miles from Disney's Hollywood Studios. After construction ended, the ride was initially set to open on July 4, 1994, however, Tower of Terror opened on July 22, 1994, along with the Sunset Boulevard section of Disney's Hollywood Studios. Engineering The ride system employs specialized technology developed by Walt Disney Imagineering, particularly the ability to move the vehicle in and out of the vertical motion shaft. The elevator cabs are self-propelled automated guided vehicles, which lock into separate vertical motion cabs. The cabs can move into and out of elevators horizontally, move through the "Fifth Dimension" scene, and on to the drop shaft. The Florida ride runs on a unique loop system, with two identical ride systems built within the Tower. There are four shafts in the back section of the building containing the dark-ride portion of the attraction. After the corridor scene, the four shafts merge into two, with identical "Fifth Dimension" scenes, and then a cab enters the single drop shaft. After the drop sequence, the elevators unload in the building's basement, then return to one of the show shafts to re-load the next guests. The Twilight Zone Tower of Terror initially featured a single drop until May 1996, when the ride was upgraded with a second one. A third drop was added three years later in 1999. In January 2003, the attraction's triple drop was replaced with randomized multi-drop sequences selected by a computer within the ride. In order to achieve the weightless effect the Imagineers desired, cables attached to the bottom of the elevator car pull it down at a speed slightly faster than what a free fall would provide. Two enormous motors are located at the top of the tower, measuring tall, long, and weighing . They are able to accelerate at 15 times the speed of normal elevators. They generate 275 times the torque of a Chevrolet Corvette engine, reaching top speed in 1.5 seconds. The ride's slogan, "Never the Same Fear Twice!", refers to