The Ghost Ship

You are recruits of a new pirate crew and to be accepted you must pass a test. The moon grants a very special mission: once every 100 years, on the third full moon of the year, a ghost ship appears whose entire crew and treasure are cursed. There is a single treasure that is not cursed — and you must fetch it for your new pirate crew. Right now the ghost ship’s sailors are ashore to gather a new rum supply they’ll recover from underwater for the next 100 years, but their time at the surface will be over again in 60 minutes. So you must hurry — if you’re still aboard when the ghost ship dives, it will drag you down to scrub the deck as cursed slaves for the rest of your life.