All images of the cannon and damage can be found here. Our faction members just logged in within the last hour. All the chests in our chest room have been emptied. In every layer of our wall except the outside, no sign of forced entry is present. Not a single block was broken, and this is in claimed territory. On the inside, a creeper egg was used to blow into our PIGMAN spawner, which we had four of. That's 1.2 million in spawners down the drain along with a dub of p2/p3 mixed, a dub of obsidian, a dub of TNT, and a large number of enchanted swords. The evidence for the hack is pretty obvious. The path to the TNT cannon has an L shaped path, which is too clear cut to be normal mining. The path opens onto a ravine that never has a visible sign of our obsidian walls, so only an xray could prove that there was obsidian on the other side. Reparations are needed; tens of hours of work was lost due to hackers. Staff, please help.
EDIT: It is actually two spawners valued at a total of 600k. Facts were slightly off in that section.
Ok - well obviously people can tell where bases are if they are claimed, so there's no way of 100% knowing if this was X-ray or not.
While I agree that is a possibility, look at that tunnel. Noone digs straight tunnels and turns exactly 90 degrees to face the exact orientation of a wall.