Good luck to him. A ship registered in Liberia or the Seychelles, perhaps owned by a shell company chartered in the Bahamas with a doctor licensed in Greece, all over an incident taking place in a foreign port or in international waters. Let him try to make the case that the suit belongs in a U.S. court. He’ll probably try for the jurisdictional longshot based on the fact that a travel agent booked the voyage in a U.S. city. There is probably already a clause in the reservation contract requiring binding arbitration of disputes anyway.

It’s his dime. Chances are if the case doesn’t get tossed he’ll end up in federal court, probably not his tribunal of choice.