Queenstown jet boat company KJet has launched an internal investigation and suspended operations after five people were hospitalised on Sunday in a crash.
The Transport Accident Investigation Commission (TAIC) has also opened an inquiry with two investigators due to travel to Queenstown on Monday.
There were 11 passengers and one driver on the jetboat when the incident happened at 11.40am, the company said in a statement.
"KJet immediately initiated its emergency procedures and a jetboat with two drivers was dispatched to the area."
Emergency services rushed to the scene of the Shotover River crash, upstream from the SH6 bridge.