You use projectiles and special trick shots that lose less accuracy when underwater.
Benefit: Your projectile attacks take a –1 penalty per 5 feet of water between you and the target. You still can’t use thrown weapons effectively underwater except in special circumstances.
Normal: Projectile attacks underwater take a –2 penalty per 5 feet of water between the shooter and the target.
Pathfinder Campaign Setting: Aquatic Adventures © 2017, Paizo Inc.; Authors: Amber E. Scott and Mark Seifter.