I see news reports say that an aircraft made an emergency landing then the Chopper sent to get everyone itself suffered a mechanical issue and couldn't take off. A third chopper from Moomba was then dispatched and the passengers returned to William Creek. .
The William Creek Facebook page has been posting spectacularly beautiful photos of the lake in recent weeks. I struggle to imagine Trevor on FB, so I'm guessing the photos are from the chief pilot. Its worth a look.
Trevor is quoted in one of the news reports saying the passengers had a " muddy evening and a sticky one". So I guess that part of the lake is in the awful dry, but goop that your feet sink into stage.
Don't know whose aircraft it is. I know Trev spends a lot of money to try and avoid these failures. Sounds like a memorable experience for those involved!