All ant fights are underground ant fights. Ant fights are an essential part of ant culture - the seedy grimy part that they don't cover in the booklet you get with an ant farm. Betting is commonplace, and it is not unheard of for an ant to lose a bet and have up to 5 of his legs broken. The ant cops would crack down, but some dirty ant cops won't allow for it. Ant corruption is a real problem.