How cold was it when the four foot deep pond froze completely? It should not freeze that way completely considering the depth.
Even if the goldfish froze completely, it is unlikely to survive. Theoretically, if the goldfish froze over, so does the water inside its body causing the cellular structure to explode and the tissues expand which potentially kills a fish. Unless your friends know the bottom doesn't actually freeze as they thought, I would not believe easily the goldfish can survive freezing temperature. Why do you think it is advised to put goldfish indoors during winter season where ponds are shallow?
I agree completely.. that is why I was questioning this practice
to be honest.. I thought the guy was messing with me lol