You must look at his web site and learn a lot more about the marine life in the antarctic waters. These waters ate -2degrees celcius. Animals must solve the problem of not freezing when their environmentis colder than the freezing point of fresh water. This is another situation set up in the Crary lab aquarium for filming. THis is what happens in the Ross Sea, a rather shallow body of water that is ice covered at this time.
Sea spiders look really fragile.