I’ll bet it waterplaned a bit before sinking to the bottom.
Maybe that’s why the brakes failed to stop it on the runway: too much standing water on the tarmac.
Can engine reversal only halt a plane??
Duh.
Look it up too!
https://aviation.stackexchange.com/questions/14521/can-thrust-reversers-alone-steer-and-stop-an-airliner