Faster you go the harder you hit things which will put a hole in the hull, Any boats always has a risk of sinking being in ice even an ice breaker, Even being in the water.

yeah but if they have to run they can easily slip away and they will never find them unlike with the Farley Mowat which couldn't even do 13 knots, they can easily go over 40 knots and go beyond to International waters were the coast guard can't do anything