Good idea on the message going out to 4 or five people first. When I was on the aircraft carrier, I was a corpsman. We used to have "man overboard " drills. Sometimes the Captain would pull a random guy from 5,000 on board, and hide him in his office. They would call out the drill. Then 5,000 men would have 15 minutes to muster and report to different individuals, those individuals would account for all the men on their list and report to one central place. If all went well, we would know who was missing and go to work, pulling their medical records and getting an idea of their general health before they would even be out of the water. (if they were actually in the water and found) Not a small task sometimes. We worked around the clock in shifts. So at any given time, guys might have to jump out of their bunks, get out of the shower, off of the toilet or whatever, and have to possibly go from one end of the carrier to the other, and up or down different levels. All while 5,000 other guys are trying to do the same thing