The first known existence of a looping water slide was at Action Park in Vernon Township, New Jersey in the mid-1980s, named Cannonball Loop. This slide featured a vertical loop but was repeatedly closed due to safety concerns. In the late 2000s, Austrian manufacturer Aquarena developed the world's first safe looping water slide, known as the AquaLoop. The company engineered a slide with an inclined loop rather than a standard vertical one. The slide is currently licensed and distributed by Canadian water slide manufacturer WhiteWater West. There are nearly 20 AquaLoop installations around the world. The first installation was in Slovenia in 2008. The largest collection is located at Wet'n'Wild Gold Coast in Australia which houses 4 AquaLoops that opened in 2010. Wet'n'Wild Gold Coast was also the first to install more than one AquaLoop at a single location. The AquaLoop uses a trap-door to release riders down a 17-metre (56 ft) near-vertical descent at a speed of up to 60 kilometres per hour (37 mph). Riders experience 2. 5 Gs in less than 2 seconds. The whole ride is over within 7 seconds.