Was the sound a 5-20 second beep? If it was, your laptop probably crashed due to a particle from space colliding with the processor. If you were listening to audio coming from your laptop at the time, then you probably heard a loud, low frequency stuttering noise assuming your laptop did crash.
Sounds briefly playing when a laptop crashes is normal. It’s happened to me roughly 2 or 3 times this year.
Is it possible that my new laptop is hacked?: 8/31/2018 13:01:44