1. Prepare for the sewer descent
- Use the sleeping bag in the large hall as a respawn point.
- Make a Rope from 2 Vines + 1 Stick in hand Crafting.
- Bring a torch and food. Keep free inventory space to collect the Hammer.
- Find the handwheel behind the hall's stairs and turn it to lower the water.
- Go upstairs, find the wall spike and attach the Rope to descend into the lower passage.
2. Operate the sewer wheels and reach the pipes
- Pass through the first door below; turn left, then right toward another handwheel.
- Turn that wheel and return to the passage it has drained.
- Climb down and take the left branch at the next split.
- Climb the ladder and look upward for rusty overhead pipes.
- Continue through the water route. An eel patrols the flooded section; allow stamina to refill before swimming across.
3. Reach the Hammer room from above
- After swimming to dry ground, turn around and look back toward the pipe you passed beneath.
- Climb onto the rusty pipe over the water.
- Crouch along it. Where the raised pipe meets the low ceiling, jump while crouching to clear the obstruction.
- Follow the pipe to its end and drop into the room containing the Hammer.
- Take the Hammer before leaving.
4. Break the rusty gate
- Equip the Hammer.
- Face the nearby rusted metal bars and hit them with the Hammer until they break.
- Go through the opened route and return toward the large hall.
- Use it again on the rusted basement gate near the hall's large doors to reach the Big Smelter and the key-forging route.
Stuck? Check the obstacle type
| What you see | What solves it |
|---|---|
| Rusty metal bars or gates | Hammer |
| Wooden or stone door asking for a key | The corresponding key |
| Yellow Goo Pile | Pickaxe |
| Need to replace a lost Hammer | Workbench, 3 Iron Rods + 3 Rocks, after obtaining your first Hammer |
If you reach the far bank without the Hammer, you missed the return climb onto the pipe. Swimming across is only the middle of the route.