just wondering if anyone has or use's ICE BATHS after a workout?

i have been hearing from a few of the guys and girls that are in my local club that after a good work out they swing by the servo pick up a few bags of ice, get home and dump it in the bath with some water. Then they sit in it for as long as possible! is there any health risks of crashing your body temp like that? and what are the benifits?

thanks