There is a huge base on PvE1 without a sign, and is open with crates inside. Also, a vehicle is also here without a sign. -703 54 30
The player logged out two hours before you made this post. The player spent the 47 minutes he or she was online building what you see. If, upon logging back in, that player closes off the base as-is, it will be 19 cubic units. The player will be given a reasonable amount of time to finish building the base.