Wouldn’t the under-field pipes be drained now? And the pipes in the stadium wouldbe drained after the season, right?
They have the system in the field to keep the field from freezing. There is one at Heinz Field. If they a glycol system the pipes should not freeze up, but the ones in Lambeau did in 1967.
The legend behind the Ice Bowl was that the In-field heating system pipes burst and froze the field.