Plunge

Plunge is an aquatic dungeon inhabited by mostly Silverfish. Creepers spawn around the surface of the water and most of the chests are underwater. There are underwater glass domes that you can get a breath in if you didn't bring Water Breathing potions. Loot here is primarily fish!

Mobs

 * Silverfish
 * Creeper

Alternate Routes

 * Furnace also leads to Plunge

Loot Tables

 * ChestF
 * ChestI
 * ChestH

Tips

 * Bring Water Breathing potions
 * Nightvision could help you find some chests