3SGE
Long night

Giving the car some shit tonight, was kinda low on oil and a bit of oil stabiliser revving at around 3-4000rpm. Something went pop and oil rushing out (not sure exactly where ) but just to the left of the oil filter when looking down at the engine.
No oil left its all leaked out, any ideas on what it could be Im guessing crank seal? Hoping its not that serious, any other possibilities ?