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It sounds like you're referring to a tragic incident that occurred at Dreamworld, a theme park in Australia. On October 26, 2016, four people lost their lives on the Thunder River Rapids ride at the park.

The incident occurred when two rafts collided on the ride, resulting in the deaths of four people: Cindy Low, 42, and her brother, Kane Low, 32, from New Zealand, and Roozi Araghi, 13, and his brother, Matthew Araghi, 12, from Australia.

The investigation into the incident found that a faulty pump caused the ride to malfunction, leading to the collision. The park's operators were subsequently charged with multiple counts of manslaughter and were convicted in 2019.

Dreamworld has since implemented new safety measures and protocols to prevent similar incidents from occurring in the future.