Scuttle Alley

From publisher blurb: The party is tasked to go into a narrow strait of water where shipwrecks abound. A peace offering between two countries is dependent on the recovery of a specific item on a shipwreck. The PCs will be given transportation and the limited ability to breathe underwater in their efforts. This adventure setting was designed for 5th Edition rules for the Filbar Campaign for six, fourth level adventurers and DM.