After over a year of saying I was gonna explore this drain I finally did it.
The group consisted of 5 of us including Afromunch from the forums. Getting in the entrance was a bit of a tight squeeze as the ice had frozen the gates partially closed and we had to slide in on the ice at the bottom of them. The first kilometer and a half or so were mostly uneventful until one of the guys we were going with forgot he had to call in for work. He ended up running ahead a few hundred meters to a manhole where he could get a bar or two of reception.
After looking over a map it turns out we made it about 3/4 of the way through before we agreed it would be best to turn back. Overall this was the best location I have explored. It blows everything else right out of the park. The sheer size of the pipe in picture 1 is unbelievable and the picture doesn't do the location justice.
Here's the link for the pictures: https://imgur.com/a/2AzUb