First practice at the Azerbaijan Grand Prix was cancelled after George Russell’s Williams was damaged on a loose manhole cover.
The Briton’s car caught the edge of the cover between Turns Two and Three and it smashed the floor of his car, which then shut down.
The cover appeared to have been loosened by Charles Leclerc’s Ferrari.
In farcical scenes, the truck bringing Russell’s car back to the pits crashed into a bridge over the track.
That leaked hydraulic fluid on to Russell’s car beneath.
Race director Michael Masi soon cancelled the rest of the session, in which only the Ferraris had set lap times, to try to resolve the multiple problems.
Masi will have to not only make sure the damaged cover is repaired but also check the remaining covers around the track – and ensure that the bridge that was damaged is structurally sound.
There are thought to be 300 manhole covers around the circuit.
Russell said: “There was a manhole cover and I got the biggest smack on my body. The engine turned off, it’s ruined the floor and the chassis could be ruined.”