Working on a Close Quarter Combat test zone so we can work on our CQC combat and make it better. pic.twitter.com/nkxC7sB7wU

— Arclegger (@Arclegger) January 6, 2016

We have a lot of zones, for example this is the test zone that basically is completely flat with a grid as the floor. We use these test zones so we don't interfere with the rest of the team that is implementing things on zone 1.

This small scale CQC area is being created so the combat designers have a playground to test and balance combat tweaks, and for some programmers to help with client/server latency and make the overall combat gameplay feel better.

Source: Reddit r/H1Z1