Base Disappear?

Hey guys, I'm super new to the game so if I'm not aware of something let me know please.

I made a cute little base on a server last night, and I woke up this morning, and there's a giant hole in the ground. Does this mean some jerk nuked me from orbit, or what? I just want to know what I did wrong, and tips for avoiding this in the future, because it really wasn't cool

If anyone has servers to recommend let me know!