If you’ve been on a few cruises, you’ve probably heard the occasional (and often way too loud) announcements made over the loudspeakers. Generally this is limited to the mandatory evacuation drills or special events and circumstances, but once in a while a voice will declare a “Code Alpha” or “Code Bravo” is in progress somewhere on the ship. These mean there is a medical emergency or fire (usually very minor, thankfully) on board, respectively. “Code Adam” also exists in the event of a missing child, and “Code Oscar” means man overboard. No need to worry in these situations, because if the issue were more serious, the passengers would also be informed.