Elle,
If you can resize the pics I'm sure those on dialup would appreciate it. Up until a few months ago I was one of those stuck with a slow connection. Anyhow...on the damage. Am I right in assuming the crinkling was just around the skimmer? I can't explain why it would happen but it looks like the water froze and was at or above skimmer level, then the water level and thus the ice block dropped and the ice chunk in the skimmer, attached to the massive ice block in the pool, pulled the skimmer and wall down. On my IG pool I routinely leave the water about halfway up the skimmer throat but I do ram a rectangular block of foam into the skimmer throat so no ice chunk protrudes into the skimmer. Your case sure doesn't look like what I would expect from ice expansion.
Al
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