At the beginning of every cruise, guests are required to attend the muster drill in compliance with the International Convention for the Safety of Life at Sea (SOLAS), 1974. This insures all guests know the emergency evacuation plan and how to use it.
Later in the cruise, though, you may hear various code words over the public address system. One of them is "Oscar, Oscar, Oscar."
Who is Oscar, anyway?
To be sure the crew is always ready, drills are held every month while in port so the crew can practice. These images are of a drill.
So, now you know who Oscar is when he is paged on board a ship.