Alaska Pipeline Permafrost Protectors

The two radiators on top of each pipeline support are passive chlorine gas freezers. This is a really clever and quite old technology with no moving parts, capable of keeping permafrost frozen when the pipeline is full of hot oil. Without the freezers, the pipeline would topple over and break into pieces. The question is, when the permafrost melts all around the pipeline, will the freezers be strong enough to keep the pipeline frozen in? The answer is of course, not.