Hmmmmm..........Obviously weather and if its night would severely lessen chances.
Given reasonable day weather a ppl without radio assitance, I guestimate, would have a very slim chance.
Same conditions, with radio guidance would have low but not too bad chances of not dying but would probably damage the plane or something else or both if they did pull off a landing.
What do you think about someone on a trial lesson having their instructor die on them?
I think its unlikely theyd die, especially with radio assistance.