Austrian manufacturer Aquarena[2] developed the world's first mass-produced fully inverted looping water slide, known as the AquaLoop.

[7][8][9] 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).

After a countdown, a trapdoor opens and the rider immediately drops 16 metres (52 ft) inside a near vertical slide.

Their water slide featured a vertical loop but was repeatedly closed due to safety concerns.

[41][42][43] More recently, ProSlide developed the SuperLOOP which features a fast, downward spiralling helix after a trapdoor release.