Some scary scenes occurred early on during Formula 1’s British Grand Prix on Sunday after a collision caused Alfa Romeo driver Zhou Guanyu’s car to flip in what was a terrifying wreck. Thankfully, Guanyu emerged from the wreckage okay, and the Chinese driver took to social media to alert fans that he was doing okay after the horrific accident.

Guanyu left an encouraging message for Formula 1 fans, putting to bed any worry that he had come out of the crash worse for the wear. In his tweet, Guanyu wrote, “I’m ok, all clear. Halo saved me today. Thanks everyone for your kind messages!”

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The accident occurred before the end of the first lap of the race at the F1 British Grand Prix. Ahead of Turn 1, Guanyu could be seen losing control of his car after an apparent collision with George Russell (Mercedes) and Pierre Gasly (Scuderia AlphaTauri). Guanyu’s car spun out at a very high speed, resulting in the car, with Guanyu inside, flipping over the tire barrier before coming to a stop after reaching a catch fence.

Guanyu credited Formula 1’s “Halo” cockpit technology for saving his life in what could have been an otherwise fatal crash. After going for medical testing, the Alfa Romeo driver was cleared of any serious injuries, and made sure to quickly notify fans of the sport that he was doing alright.

Sunday was a stark reminder of the dangers that drivers put themselves through every time they race. Guanyu’s accident had the entire F1 world holding its breath, but thankfully, Guanyu was okay.