First thing, great mod. I've been having a lot of fun with it.

Second, I've been trying to craft a scenario in which the player(s) have to search the wreck of a sunken ship to find "The McGuffin" and save the world. Got the idea from reading "World War Z"'s description of naval forces and zombie behavior under the water.

1) the wreck site would be in hostile territory, so you may have to infiltrate, or be prepared to fight your way in against human forces on the surface and hold the surface of the site,

2) there would be other factions (Some non-governmental) also interested in getting "The McGuffin" first, or reacting to your team's presence, so you may have to fight other human divers in and under the water near the site, and

3) the large number of zombified passengers and crew infesting the site. Large ship with lots of interior volumes, passages and nooks and crannies that will need to be searched. Think haunted house, but underwater (or maybe a sunken village, like from WWZ instead).

4) If you don't hold the surface over the site against enemy Naval QRF, be prepared to fight your way out. Decisions on how to prepare for, and carry out, the mission will have consequences.

I'm looking at scaling the opposition so it can be done as a single player infiltration mission, a small MP team, or a MP "Cecile B. Demille" production.

But,the very first obstacle I have run into is also the most important. I've been trying get zombies to spawn under water near the wreck and essentially just walk around on the bottom, exhibiting regular zombie behaviors, just underwater.

As it is now, I can spawn zombies underwater, but they end up floating around just under the surface of the water, walking around at about one fathom, not staying on the bottom.

Is this a limit in the A3 game code, or can it be modded around?

UPDATE: In case anyone was wondering, I also tried with RAVAGE zombies, which can swim but they eventually drown.