I'm thinking of encouraging my friends to jump into the deep, wide open flooded quarry.
I'm not sure that your friends will be okay with doing this.
I'm not sure either. It depends.
You shouldn't be encouraging your friends to do dangerous things. They could be hurt and then you will feel guilty and blame yourself.
It will be fine as long as I jump in after them if they're drowning.
And what if you can't save them from drowning? What if the current is too strong? You have to think about these things.