Updated for 2010!
The adventurers travel to a murky underwater kingdom, where trouble brews between the merfolk and the sahuagin empires. Soon, the party find themselves in the middle of an all-out war, between war-enthused merfolk on one side and enraged sahuagin with underwater ballistsa on the other.
War in the Deep is a 4-encounter D&D 4th Edition Heroic Tier adventure designed explicitly for easy and broad customization by DMs. Each stat block contains three different versions of every monster and NPC: one for 1st level players, one for 5th level, and one for 9th level players. Every skill check in the document is described in level-appropriate terms, so this adventure can be easily scaled to any level from 1 to 9. In addition, there are two versions of every piece of dialogue: specific text that you can read verbatim, and generic text that you can customize based on your own speech pattern.
The PDF contains both a portrait layout of the adventure (for easy printing) and a landscape layout (for easy reading on a laptop while DMing).
And, of course, there are battle maps for each major encounter, in full color but also color-corrected to print perfectly on black-and-white printers.