Following the Reddit thread on this situation and it sounds like they are trying to confirm if the person spotted in the water was from the Wish or possibly some other ship. Several ships left port around the same time, or it could be someone from a smaller boat that capsized. Interesting use of the muster stations that had never occurred to me. Sad if people are not complying.
ETA: announcement just made that all guests are accounted for
ETA: announcement just made that all guests are accounted for