How do you unlock the sewers in Stardew Valley?

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Tags

1. #items
2. #located
3. #minerals
4. #south
5. #rusty
6. #sells
7. #unlocked
8. #obtaining
9. #pelican
10. #either
11. #artifacts
12. #cover
13. #after
14. #donating
15. #location
16. #grates
17. #krobus
18. #entered
19. #sewers
20. #through
21. #museum
22. #sewer
23. #forest
24. #cindersap