SAFEwork SA is investigating a skydiving accident on the Fleurieu Peninsula.
On Sunday 2 May, emergency services were called to McLaren Vale following reports of a malfunction during a jump.
SA Police said a parachute became tangled or failed to fully open during a tandem jump from a height of about 4,000 feet (1,200 metres).
Witnesses recalled seeing the instructor and his customer tumbling towards the ground.
The 41-year-old instructor and the 27-year-old first-time skydiver were taken to Flinders Medical Centre. The instructor is in a stable condition after sustaining serious but non-life-threatening injuries while the other man has been discharged from hospital after being treated for minor injuries.
SafeWork SA and the Australian Parachute Federation are investigating the circumstances surrounding the incident.