Board Thread:General Discussion/@comment-25146373-20150111011453/@comment-2158701-20150119083603

Yes. All the below methods mentioned will be assuming that there are no protection plugins to protect your base. As you didn't mention nukes were banned, enough nukes will chip away at a thick reinforced stone wall. They aren't nuke proof you know. Enough of those and they can at least nuke your base from the outside. Also, people can teleport in your base via the nether.

If you truly want nukeproof walls, cover all your walls in oil. When you cover something in it, it's completely immune to nuke explosions. The idea would be, outer layer of safes, middle layer of oil, inner layer of reinforced stone or whatever. In that way, the personal safes also stop water-piercing cannons, which work with the same concept against oil as it does in vanilla MC. If you aren't familiar with that, it works by launching both an explosive and a sand/gravel block. When they both occupy the same block, the sand/gravel partially cancels out the explosive resistant properties of the liquid it's in.

As for the nether, prevent people from entering in the equivalent place in there also. The dimensions of that nether barrier should exactly match the equivalent dimensions in the overworld, x8 and all, or people will go back and forth between the two worlds until they get in.

And then, finally, a method I came up with which I won't reveal since it's a bit too op (though it isn't THAT hard to figure out really), but if the server doesn't have protection plugins to protect your area and I were the raider, I'd just deploy a teleport-cannon and teleport nukes and their ignition into your base and blow it up from the inside. Without protection plugins there's 0 way to prevent this. Luckily I've never seen anyone use it so it's unlikely you need to worry about this one.

There might be more ways to get in of course. Those are just the ones off the top my head.