A few years ago, whilst accepting a flight information service in an airfield zone, heading roughly 180, I had an aircraft approaching approximately the same height and reciprocal heading.
The occupant didn't see me.
There was no time to turn right ( had I done so, I am convinced it would have hit me).
I shoved the nose down and firewalled it. I felt the prop wash as it flew over, or something similar.
I radioed the FI service, they were not aware of the other aircraft.
My passenger, head down hit the ceiling, we both got covered in dust that flew up from the cockpit floor.
It was over in seconds, my natural reaction was to dive.
Perhaps it was lucky the other aircraft hadn't seen me, the outcome might have been different.