A number of the worlds largest ferries - 50% longer than USS McCain - are routinely navigating in very restricted and crowded waters in the archipelagos of Stoc

A number of the worlds largest ferries - 50% longer than USS McCain - are routinely navigating in very restricted and crowded waters in the archipelagos of Stockholm and Helsinki with a clearing under the keel of just a few meters. They seem to manage avoid colliding with both commercial traffic and the numerous sailing yachts while doing 18-20 kn. Accidents have happened, but it's not recurring events. One exception in the Baltic see is the Polish M/S Jan Heweliusz, that was involved in a number of of accidents, until it finally capsized in hard weather.