As most of you would have heard, ANZAC drain now has a small fence around it with a locked gate (you can walk around it with little effort).
There is also a knee-deep dam there (you can't walk around it

A few explorers have recently been hassled by police & may receive court summons or fines in the mail.
They didn't hang around the entrance, were not seen by people on the river or bike-track, or did anything stupid at the Chamber.
This has happened three times in a short period of time (3 months) so it's possibly a coincidence or (judging how quickly the police have arrived) there may be surveillance on the drain (you wouldn't see a camera across the river up on a building, but I can't imagine it being manned 24/7. Maybe a sensor at the Chamber?).
My friend that works for MW has said the fence was put up after a rave was held at the Chamber with hundreds of people present and that by putting a fence with a locked gate they can now get you for trespass even if the Entry Prohibited sign is painted over it ripped down.
He said they want to stop people going into the drain (good luck).
Anyway, I just thought I'd give you a heads up. Make of it what you like.
Cheers.