DIVE

From publisher blurb:

DIVE is a toolset created to play scenarios reminiscent of Jaws, Deep Blue Sea, The Abyss, and other aquatic Horrors. While Mothership deals with the hardships of life in space, DIVE players contend with the many struggles of life on, under, or near the ocean. Inside you will find alternate classes, rules for dealing with depth and pressure, an additional Panic Table for when players are scuba diving, an DIVE-specific skill list, new equipment, alternate trinkets, a new table of tattoos, as well as tools to help Wardens navigate their aquatic nightmares.