Right Rufus The Organons are marching into the ascension station. Rufus should get there also. Maybe those crates would help...
Go to the pipe on the right.
Did you try to go to the crates?
You should distract them. Push the button in the lamp post. It also lights the lamp in the sewers.
Now you can approach the crates. Those that are going to Elysium are marked with corresponding pictures. That's it for now. Go try something else with other Rufuses.