I read a news article from the States last year where a pressure ridge opened up right through a tent two guys were fishing in. They scurried out before some of their gear went into the water. I think the flip shelter stayed topside.
BTW, you'd better start questioning yourself, as there was around 8" where that ridge opened up.
I packed up and left after that ridge fired off near me. I figured it was a sign from the Fishing Gods.