To find this cache you will need to find the other GeoTalk cache set by the Tasmanian Branch of the Axis of Evil, GeoTalk Listeners vs the XoE #1. That will tell you what to do.
When seeking this cache, please remember who is sending you off on this mission. You might encounter mega fauna, carnivorous flora, and the living results of the XoE's experiments, let loose. The countryside you must travel through may be untamed, with overflowing streams to cross, sheer drops to navigate, and loose footing. Keep in mind that the XoE has been engaged in meteorological experiments, so just because the weather may seem fine when you set out, do not count on it lasting.
If that has not scared you off, let the challenge begin!
Congratulations to gspblu for being the first Tasmanian to DEFEAT the Axis of Evil!