What is this? hack?

hello (:

today i found two guys grinding mobs UNDERGROUND!
any idea of what this could be?

http://i.imgur.com/O1CnXof.jpg
http://imgur.com/a/YIXnw

Bots, report and move on.

That's all you can do.

Yes, they are hacking the game, they are also bots. Report them if you run across anyone doing the same.

Probs fly hacking or just found a terrain glitch

how i report then?

Edit

nvm found it, thank you (:

seems like botters (illegal activity so report etc.). of course if someone would go and trade them to break their programs... (not endorsing harassment or anything :D)