Jammy. Have you got an Iphone or android?
With android you bring up the voice recorder, hit record then go back to main menu leaving the recorder running with only the app icon in your notifications bar.
I agree with Sagitar.
Looks quite legit to me and it's unlikely that the occupancy of the bus would have died during a roll over.. And I would place bets on its being very slow speed too.. I.E the bus manoeuvring