The rocket nozzle imploded .
A welding seam opened resulting in the expulsion of all the ethanol fuel ( some 500 L ) in just 3 seconds resulting in a large fire which damaged the part of the rocket .
The rocket nozzle imploded and a welding seam opened resulting in the expulsion of all the ethanol fuel ( some 500 L ) in just 3 seconds resulting in a large fire which damaged the part of the rocket .