We have been trying to figure this out for weeks. The below link explains how to get the Easter Egg enabled in zpo_aquatica that releases the “Ghost Girl”:
http://steamcommunity.com/sharedfiles/filedetails/?id=157434123
If you don’t feel like going to the original post, the steps are listed here below:
1. Win zpo_aquatica map two (2) rounds in a row (winning two in a row is the key) as a human
2. After a two round win, in the ZPS Ready Room, the Victory Scoreboard (large TV screen in the center of the room) will now show:
HUMAN VICTORIES
2
1337
3. Once you see this on the Victory Scoreboard, this now means that the Easter Egg Is Ready To be Actived
4. To activate the Easter Egg: Start round three (3) as a human. As soon as the round starts, ACTIVATE ALL elevators and wait a few seconds. If successful, you will hear a very loud explosion (BOOM!) and see the floor shake. The Easter Egg is now Active!
Enjoy!