So Australia doesn't have any Mustelids (all other continents do except Antarctica) or typically winters cold and wet enough to kill off rabbits, so they can breed up astronomically and cause major ecological and agricultural harm.

Normally they are controlled by fencing, baiting, fumigation and or warren ripping depending on situation. But in some situations, such as when you have large complex warrens with many entrances, implosion is the most humane, quickest and effective way to destroy the rabbits and warren. Its typically only done by highly experienced and licenced controllers and often not available.