In episode 3 of Descent into Avernus the team discover that the relaxing bathhouse lies above a horrible secret, Cultists of the Dead Three! As they venture into the dungeon, things become more sinister, deadlier and smellier.  

Here's a link to Descent into Avernus: https://dnd.wizards.com/products/tabletop-games/rpg-products/baldursgate_descent  

You can download and start using DnD Beyond for free here:  https://www.dndbeyond.com/  

Syrinscape is a free download with a bunch of free soundsets too! https://syrinscape.com/download/