So I signed up for a Closed World Experiment last week and last night was the first night. After some troubleshooting, it got up and running.
And then a PvP griefer found diamonds and iron in the first 5 minutes and proceeded to slaughter all he saw with the help of a minimap mod. Later that night, we took him down, got the anti-radar thing going, and he didn't show up tonight.
Tonight was filled with progress, alliance, minor despair, and a railway between bases. We've come to terms with the fact that Sugar Cane and Pumpkins may be extinct with the loss of the PvP Griefer. This means that there will be no enchantments (village didn't spawn in our area). We found an abandoned mineshaft and a ravine, and we believe there are skeleton, zombie, and cave spider spawners still alive.
Our area is 250x250. We've mined out half a ring around the world underground.
Also our reporter randomly appearing is scaring the hell out of people. We're all on edge because we're not sure if anybody is hostile or not right now. I've been doing my best to be friendly to everybody.
Experiment will last for 2 weeks.