Cal Crutchlow walked away from a high-speed crash during the early stages of MotoGP's group test at the Catalunya circuit.
The Briton had only completed one fast lap when he hit a wet patch at around 200km/h on the approach to Turn 4.
While Crutchlow was relatively unhurt in the accident his bike was destroyed, with some parts apparently clearing the perimeter fencing.
"Massive, massive crash 2nd lap on wet patch under bridge no one could see. 200kph ...," Crutchlow, who finished fifth in yesterday's Catalunya Grand Prix, tweeted.
"Took a lot of skin off my arse back and shoulders but am ok! Went back out as we have a job to do. So sorry to boys as bike was totalled."
Crutchlow has since been able to rejoin the test on a second chassis, and was 11th fastest at the lunch-time break. Honda's Casey Stoner led the way with a 1m42.458s, ahead of team-mate Dani Pedrosa.