Escape the sewers! is a mission in Ratchet & Clank, taking place in Blackwater City on planet Rilgar. While Ratchet and Clank searched the sewers, they eventually hit a button causing the sewers to overflow, forcing them to escape. When they did, they found the Shady Salesman, who gave them the Trespasser, and asked them to find RYNO holocards, a type of holocards with schematics for a weapon known as the RYNO. This mission was required to begin the mission "Find the top secret Blarg research project" on the Blarg Tactical Research Station in Nebula G34.
Beginning where the previous mission left off, press the green button. This will open the door in front of you, but cause the room to keep filling with water. Run forward through the linear sections, jumping through platforms and avoiding amoeboids, and making frequent use of the Helipack to stretch jump forward. Ensure that you don't fall off any platform or get hit by amoeboids so that you can continue uninterrupted. Eventually, you will end up in a circular tunnel leading upwards, surrounded by blue, and the water will stop rising. From here, head forward until you find an elevator, then take the elevator to an outdoor area, the Blackwater Market.
Here, you will find the Shady Salesman, who will ask for RYNO holocards. He will give you a Trespasser. An orange forcefield blocks your way out, so use the Trespasser in the Invinco-Lock to the left of the exit by pressing to begin. This begins a short minigame in which you have to connect lasers to ports. Press or to move the first laser to the port, and press to move to the lower ring and then move the next laser to the next port. This will open the forcefield and allow you to obtain your first RYNO holocard. Stand on the green button on your way out, then use the taxi to leave back to your ship.