Well, it's good to hear that you changed your password as a precaution, but computer hacks are far and few between unless you visited malicious links and/ or websites that had spyware/ viruses in them.
I investigated some of the tunnels and have come across various instances where the x-ray came in to play. If it weren't x-ray, I would have expected a lot more than just 1x1 tunnels leading to and stopping at precious ores. Spamarian had to use torches in some of these tunnels, but now since the Night Vision potion has been released, I was able to see some of these tunnels without the use of torches.
The first two images shows your tunnel popping out into wilson2763's farm
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FlzW3t.png&hash=6c95c2c49e359d4d95c13d514d2aeaad)
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2F97R3U.png&hash=88ff533884c6f1a50c0f40ed0f16abaf)
Then, we're on to the other tunnels
A vertical shaft (a common x-ray trademark)
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FJZ2EN.png&hash=9d1c6f7db1ecf3e20cc5a7fdabe9a28b)
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FmZvgF.png&hash=6103b44d7ea7c56c6965bdc7b6e92693)
Then we have areas where you zeroed in on various ores and stopping there (another common x-ray trademark)
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FuiGQ5.png&hash=7e5891ce2ca60a341421cb6b827b0756)
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FQKBpE.png&hash=3136752206b97490cac1d85bcdc91651)
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2Fo8etq.png&hash=51097070cbc432a2937f8c43d5cce1e7)
Torches were placed by Spamarian at the time he checked out the tunnels.
(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FAFnxa.png&hash=234e723d3b3a588d0323a6230bc83a79)
As you can see, it's not very hard for us to tell the difference between normal mining and mining with mods/ hacks. It's simply hard effort to track down all of the individual tunnels to come to a definitive verdict. It's not, "Oh, I see an x-ray tunnel. BAN!" We go in and look at it thoroughly.
However, since the tunnels here weren't as extensive as some of the others we saw in the past, we might let you back on here, but you need to make absolutely certain that you do not have any type of mod or hack that will give you an unfair advantage above other players. This is covered in the SMP Rules (http://www.opticraft.net/index.php/topic,6784.0.html) (which I highly suggest you go through).