Although this ship had changed to a Frozen Ghost Ship, its nature had not changed much. Since Roy and Cassandra hated sunlight, Roy had frozen the ship not only to create a sense of mystery but also to use the temperature difference on it to create fog to block the sunlight. As such, the entire ship was actually covered in a thin layer of fog, and only by approaching it could you see the Frozen Ghost Ship clearly.
By the time you discovered this ship, you were already very close to it. It felt like a ghost that appeared and disappeared, which was why the people of the Caribbean Sea called this ship a ghost ship.
