Nah, just have, like, a failed computer check result in an “ice generation containment breach” and then a nearby door is open. Inside is a small room full of “ice block” which is a creature that reproduces and makes a new one next to it ever 300 tics OR, if there are no open tiles, it “smashes” anything nearby that might be breakable (like the player).
Call it “living ice” - it just expands and expands! It’s totally doable and would be super awesome. Heck, maybe I’ll just build one tonight for you to use.
Pretty sure that rule doesn’t apply when the posts are more than a week apart. 