How do I reach the other assasins in the sewers?

[fematmar]

I searched every where I could reach/access in the sewers of kuudad, and
solved the 3 chest puzzle, and killed the assassin who killed my fellow guild
member, but I cant find a way to reach the other assasins there-though I
can see them, please some help, I dont mind spoilers.

[Randomizer]

It's part of the stairway puzzle. You have to search the buildings in the southeast part of Port Kuudad for ways onto the stairs to go up and then down.