I'll man up and admit that I was responsible for originally planting the seed of getting into Braavos' base in the first place. I was responsible of digging a staircase going downward to the level where your underground city's floor is. At that point it took luring 4 creepers into the exact location to finally break through 2 layers of stonebrick to get access into your base. At that point one of your town members, Ruka-Samurai or something, came downstairs and was snooping around, probably suspecting something fishy had just went down. He spotted me and my accomplice* and began to run the opposite direction. We chased him to the point where he was about to get hit, until he logged off. At that point 10 minutes later xFuze showed up and proceeded to absolutely crush us repeatedly (Dragoons 4 life).
Throughout this process I had noticed that the hole that was blown at your perimeter had been covered back up by dirt. After xFuze repeatedly killed me and my town members repeatedly to the tune of a 20 kill streak (I'm embaressed at how terrible we did, or at how OP Dragoons are) I logged off for the night.
Now, of course, here comes my 'excuse' for my actions. As you know, as it stands, breaking the barriors to get into a base via creeper explosion is LEGAL. I'm the kind of compulsive gamer who will try anything within the rules to get an edge, and this seemed like the best option. If left alone inside your town, I wouldn't have done what your screenshots have shown, just for the sake of it. My intentions were to steal, not to destroy made structures.
Let it be known that I've already fought against this rule yesterday. I think having the ability to do what I did to get inside a base being legal is hogwash, and defeats the whole purpose of becoming a miner as well. I would be happy if this became illegal from now on end, or if creeper explosions were turned off at all levels inside a regioned area.
For what it's worth, impressive underground area, and I'm sorry it got destroyed the way it did. As it stands though, rules are rules, and this rule is a head scratcher.