So many people are entering abandoned buildings nowadays to explore, graffiti, steal stuff, rip out copper & the like that there is generally security of some kind.
If you're over 18 you could always try www.caveclan.org and click on the Contact link.
UEGA is pretty dead even more so in Melbourne (than Sydney & Brisbane).
Ironfistdoug on Instagram, YouTube & Vimeo.
drainsdrainsdrains at gmail dot com