The Sewers is an area in Stardew Valley that you will be able to unlock using the sewer key. The rusty key or the sewer key is available from the Museum. If you donate at least 60 items, Gunther will give you the key and you’ll be able to unlock The Sewers.
The Sewers is home to Krobus, an inhabitant of the place. He sells tons of stuff, including Sign of the Vessel, Monster Fireplace, Stardrops, and many more.
There’s also the Statue of Uncertainty, in which you’ll be able to change your professions for just 10,000g.
The Statue Of Uncertainty allows the player to change professions. After donating 
10,000g, the statue requires the player to choose one skill to change. That night after the player goes to bed, the Level 5 “Choose a profession” screen will appear, followed by the corresponding Level 10 “Choose a profession” screen for the skill selected at the statue.
Only skills for which professions have already been chosen will appear in the Statues menu. As soon as the player chooses a profession to change, the bonuses for existing professions disappear. Skills that gives bonuses to sell prices will not apply to items placed in the shipping bin the day the profession is changed.
In late game players will get the quest Dark Talisman, which sends them to speak with Krobus in the sewers. Once spoken to hell open a passage inside the sewers to a new small area, the Mutant Bug Lair. Inside players can gather the talisman for their quest, catch unique fish (Slimejack) and fight swarms of bugs.
Just like levelling up a skill at the end of the day causes the player to wake up with full energy the next day no matter what, using this statue on any given day will cause the player to wake up with full energy the next day as well.
The Sewers are a location unlocked by obtaining the Rusty Key after donating 60 items (artifacts or minerals) to the Museum. The Sewers can be entered either through the sewer cover in the south of Pelican Town or through the grates in the south of Cindersap Forest. Krobus is located here and sells rare items.
1 1 of 11:Talk to Gunther in the Museum.
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Accept his task to donate any valuable items you find. Gunther is an NPC (non-player character) who runs Pelican Towns museum in the game. Walk over to the museum in the southeastern corner of Pelican Town—you can do this as early as you like in the game. The museum will be empty at first; donate artifacts and valuable items to fill up the museum and be rewarded with the Rusty Key.[1] - To get the Rusty Keyyoull need to find and donate 60 items to the museum. It may seem like a lot
