Went to plug in the block heaters. Cords are like a steel bar,have to be careful as not to break them when i plug in.
Had one cord years ago that shattered when i tried to coil it back up. Insulation broke off.
Hah... yeah that's cold. Had guys that would forget to put their boots inside their sleeping bag with them at night. The next morning when trying to or put themn on the boots broke like they were made out of clay. -65 F ambient air temp.