All these links lead to pages not part of the Orchy site.
No responsibility is accepted for any content on the following sites.

In the Spirit of Adventure	Many Sydney pictures, national drain location lists, books about the underground and listing of films with underground scenes. Very entertaining!
Sydney Cave Clan	The Official Sydney Cave Clan site. There's some information here. More on the way.
The Official National Cave Clan site	Heaps of stuff here. The Melbourne Cave Clan are even into art and merchandising. There are so many urban explorers in Melbourne, it's a wonder they don't open up a Maccas Express in a drain.
Storm Draining in Australia	A national Cave Clan site featuring exhaustive but out-of-date listings of drains, heaps of pictures, draining methods, history and reviews of expeditions.
The Bunker Boyz	A Sydney group with a particular interest in war bunkers.
Canberra Cave Men	Draining and drain information in the national capital. Maps provided.
Infiltration	An international mailing list, great rundowns of different types of places to explore and a subscription-based bi-monthly magazine on the topic of urban infiltration.