http://www.garrysmod.org/downloads/?a=view&id=113566 Background story:
The traitors barely got away from the innocent terrorists in ttt_thething, but they were soon forced to land in another laboratory area nearby due to being low on supplies. They thought they were safe there for the moment... What they soon will discover is that the research lab has been evacuated due to a parasite they had dug up from an ice block. The parasite has some alerting features... it makes the carrier traitorous!
The previous laboratory people found out how to build a traitor tester by using four magic cubes which they also had dug out. The cubes were in an ice block and had to be melted out, so they placed the block of ice in their water tower. They were too late, though, and never finished placing the cubes in the tester - which means the cubes are still in the water tower, free for the innocent traitors to use.
New in RC3:
*Improved skybox
*More optimized
*Uses the new mapping entity ttt_damageowner to prevent RDM with the different traps.
*AFK prevention system by killing the ship and whoever's in it some time after round start
*Widened the water hole entrance
*You can no longer get outside the fences
*Lots of other fixes and improvements
New in RC4:
*Shortened name of map, previously ttt_iceresarchlabs
*Longer timer on the ship door
*Outside area displaced for curvier and better looks
*A beamer instead of a ladder under the ship
*Added a sniper tower
*Instead of uninspired, random cargo containers, there's now some objects scattered around the map!
*Tester area geometry improved
*Traitor tester no longer instant. Now takes a minute to retest
*Water tower is no longer filled with water. When the door to it is shut now, the people inside will be frozen to death instead of drowned
*Various other fixes/improvements