I'm Tin. I live in Croatia but i speak English. I have a Steam account. I'm the leader of SCRT (Sven Co-op rebel team).
It's not an Easter Egg actually. It's a trigger, it probably triggers some event.
triggers are invisible though. This is probably a test or something.
I thnik this is the trigger when the houndeye spawns in that big box.
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I found this easter egg in Half-Life: Source. When i went in there, i got teleported back to the sewer.