Line art from inside cover of Sinister Secret, showing the rigging of the ship and the layout of decks.
https://files.mastodon.social/media_attachments/files/109/441/576/940/940/459/original/4bd9782301dd956c.png
The second part of the adventure involves the PCs being tasked by the leaders of Saltmarsh to go assault the Sea Ghost, the ship of the smuggling organization. It is basically "sailing ship as a dungeon."
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