Will they crash?

Spent a while today gazing from the window at cruise boats traveling around. For the last few days there have been five ships moored in Weymouth bay - free mooring in comparison to the expense of parking up at Southampton. Today it seemed they were all going in and out. We could not see them from our house when they were moored but I enjoyed watching them going back and forth from our window. The central ship is Queen Mary and the other 2 are P and O ships.