It's a fence made by an avalanche protection company and a titanium cockpit bar called the Halo that are instrumental in making the British Grand Prix the spectacle the 140,000 spectators hoped it would be - and not a black day for Formula 1. Only a few seconds after the start, the tenth round of the world championship was stopped after the Alfa Romeo of the Chinese Guanyu Zhou slid headfirst through the gravel bed, was lifted, flew over the safety barriers and landed sideways in the said fence.
"The halo saved me," Zhou said later, once he was able to walk through the paddock again.
The second accident victim, the Thai Alex Albon, is able to escape from Williams, who was injured after a violent crash, without any external injuries.
After the restart and a late neutralization, the shock is followed by numerous sporting dramas in one of the most entertaining races of recent years.
Another catastrophe almost happened when, after the demolition, several climate activists disguised as marshals and smuggled towards the runway had to be overpowered to carry out a similar protest action as two years ago.
But then, finally the sport, after a starting line-up determined by Saturday's rain.
After two and a half hours and 52 laps, only the man on pole position survived.
The Spaniard Carlos Sainz junior is in the lead for the first time in the 150th attempt, and Ferrari's second man remains so until the end, even after numerous turns.
He distances himself from the Mexican Sergio Perez, whose Red Bull Honda breaks down early on, but in the end, with fresh tires, shakes up the leading group with numerous aggressive maneuvers.
Made possible by a late safety car phase.
On the last ten laps, the positions of the top cars change almost every second.
This is at the expense of Charles Leclerc.
The Monegasque title co-favourite has been slowed down again and again by technique, tactics or his own mistakes, and this time bad luck is still with him.
Since Sainz and not he is brought to the pit stop, the Ferrari hope does not even make it onto the podium.
Internally, this will cause further discussions in Maranello, even if team boss Mattia Binotto gives good reasons for his tactics.
But a free ride for both pilots in a title race in which Leclerc urgently needs to catch up is an enormous risk.
Instead, Lewis Hamilton, the record winner at Silverstone, celebrates a grandiose comeback with third place.
He made it to third place with the completely renewed Silver Arrow, and he was more enthusiastic about the strengthened car and the popularity of the public than the result.