Someone posted a screenshot a few days ago of a maru with it's prop blown off. Evidentally it was still trucking right along however.
I've not seen any keels break apart but I haven't been using magnetics (due to their unreliability) under the keel but using contact triggers on the side of the vessel so that's not surprising.
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"When Gary told me he had found Jesus, I thought, Yahoo! We're rich! But it turned out to be something different." - Jack Handey
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