The Tempest Trials

From publisher blurb: The underwater village of Amphimara is in grave danger. Every 27 years, the champion of Amphimara performs a sacred set of trials to appease the Tempest gods, but this year, the champion never returned. Can you make your way to the ocean floor and save the village before it's too late? The Tempest Trials is a Fifth Edition adventure designed for four to six characters of 6th to 9th level and is optimized for four characters with an average party level (APL) of 7.