Yeah, I tried doing that too, the only places I didn't explore (that I know someone explored) were the entrance to King's Watch and the tunnels with the entrance by the "Mesh Generator", the tunnels that ended with a Hive Shrieker
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The only thing exploring those areas resulted in was a sense of disappointment, due to not being able to take in their beauty, and a lowered K/D, haha.
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Yeah, not really much, huh? :)