you're supposed to go into the abandoned sewer network i believe. You can get there by entering the normal sewers then on the immideate right there should be a door which will take you to the abandoned network.
(i am not 100% on this tho)
Yup that's right. 
Octavian Vanguard
@ohmsEU and @ohms 2
Badging character: Bimble on the Union server, Badgehunter.com and City Info Tracker.
Taa. Heres me wandering 'round the old network.
Many thanks 
Hi,
Am on mission to stop Rikti over running the sewer network and have been advised to look in steel Canyon/Underground sewer networks. I have 40 Rikti to 'kill' for the mission but can't find one flippin' Rikti at all!!
Am I in the wrong place? Is there some sort of map to show where these'pesky' aliens are?
Please help.
p.s. I'm around lvl 38 blaster. The sewers are full of lvl 7/8's so can't eve enjoy myself down there stompin' on some heads.