Acknowledged. To me it just seems like a building miscalculation and not on purpose.On the map Beachlanding, on the first part of the mountain on the left as you enter the beach, it can be dug unto to go underneath the adminium and have an approximate 8 block digging depth around about a third of the map.
Screenshots will be posted when I get the chance, but it seems most regular players have found this and exploited it for themselves already.
Resolved.