Direct encounters between large ocean-going cruise ships and major tsunamis in open deep ocean waters are historically extremely rare, because tsunamis pass underneath ships in deep water with barely noticeable wave heights. However, cruise ships docked in shallow ports or harbors during severe seismic events can experience severe turbulence, rapid water displacement currents, and surges. Modern cruise operators maintain advanced weather-monitoring systems to steer vessels away from coastal zones threatened by tsunami alerts.
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