An inquest in Australia has heard deaths at Dreamworld could have been avoided with the press of an emergency button.
Disaster occurred in 2016 when the Thunder River Rapids ride malfunctioned and four people were killed.
The inquest has heard the ride had already malfunctioned twice on the day the horrific accident happened.
New Zealand-born Cindy Low was killed alongside Kate Goodchild, Kate's brother Luke Dorsett and his partner Roozi Araghi when the Thunder River Rapids ride malfunctioned.
Ms Low's son Kieran was thrown clear.
The dead victims' injuries were so severe they were called "incompatible with life" and ambulance officers who attended the scene were offered counselling.