The zip past the gel wall

I have watched a few runs, but I am still confused as to how to do the zip to get back into the sewer before you go into croc for any%. I wasn’t able to find any tutorials anywhere.

I’ve also been trying the old zip to get into the sewer where you get a grapple through the wall that isn’t broken, but that keeps putting me to the other ledge and not the one with the wall.