>>96827783 (OP)
Let me see if I get this right, to make this possible, the whipped cream would need to have some enchanted or special properties to them:
>Permanency
Whipped cream dries out in a matter of hours, so it would need to be permanent in order to not just need someone to keep making magical whipped cream.
>Silence
Whipped Cream is not a liquid, it doesn't block sound like water does. So it would need to be magically enchanted to block sound.
>Hardened
This whipped cream is somehow dense enough to prevent climbing ropes from falling through it, so it would need some kind of hardening enchantment to it. And this is tricky, because if it's too hard, the person will just slowly fall like quicksand, or if it's a light person, they could just swim through it to get to the surface enough to get more air.
And even with all that, nothing really stops the party from tying someone to a rope, and lower that person around the place that the first person fell and then just pull both back.