Frozen solid

In our physiology lab, we store blood and saliva samples in a large freezer, set to -80 degrees C. Have you ever stuck your hand or arm inside a -80 degrees C freezer? I am learning that it is best to 1) know what you're looking for and 2) have a general idea of where it is located in the freezer before you go rooting around because it is FREAKING COLD in there!!!