Australia has explorable drain systems like no other. There are open canals and huge underground tunnels everywhere, they are not hard to find at all. Drains my are favorite places to paint, and I’ve spent countless hours exploring the underground tunnels all around the country, and there is just so much to see.
Please note: To anyone interested in exploring drains themselves, it can be a dangerous activity and people have died underground. Please read Predator’s Approach To Draining, which was written by Predator (RIP) of the Sydney Cave Clan and highlights the risks involved.
I don’t carry a camera, so I can rarely get good photos underground, but here are some photos of my stuff taken underground. (None of these photos are mine, all of these I found online, all credits go to the original photographers.)