Note that in some cases you'll need to wait 1 ingame tick (10 seconds) for some interaction-triggered events to start\map patches to apply. 
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You can trigger the event manually by typing this line of code  in Smapi console ( 'EventID' is the number like 19405001):      debug ebi EventID

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EVENT LIST (those conditions will work for Stardew 1.6 but - in 1.5.6 some of them will trigger automatically when you enter the Sewers):

1st ( event id 19405001 )  - 
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 Reach 2 hearts friendship with Krobus to trigger 1st event. 


2nd (  19405002 ) -  
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 Bring Rusty Cog artifact item in Sewers and interact with the broken maintenance machinery while holding the Rusty Cog in your inventory. 


3rd (  19405003 )  -  
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 Find a secret passage in the sewer. 
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  It's located in the northeast sewer wall near Krobus default standing point. 
  
 

4th  (  19405004 ) -
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 Interact with the sewer hatch after you've acquired Magic Ink wallet item.
  

5th (  194050011 ) -
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For going down into sewer hatch you'll need a rope. Find someone in town who may have it. 
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Visit Clint's shop to trigger the event.
 
 

6th  (  19405005 ) -
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  Interact with the sewer hatch after you bought the rope from Clint. 
 

7th (  19405006 ) - 
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 Interact with the sewer hatch after you tied the rope to the hatch edge. 
 

8th (  19405007 ) - 
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It's dangerous to go any further - you'll need to find a way to calm down the snakes.
Vague hint: 
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  Talk with someone who knows something about snakes... 
 
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 someone in the Casino...  
  
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 MrQi may know something...
 

Direct hint: 
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 bring Bone Flute artifact/Horse Flute/Flute Block in your inventory into snake cave.
  
 

After you finished all 8 quests, this will happen:
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You'll get +25 HP permanently (similar to QiMilk secret event) and Void Eggs will start to spawn in Snake Cave from time to time and you can collect them.
  

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Written by

Aimon111

4 comments

  1. outlawzgosu
    outlawzgosu
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    What do you do after you enter the cave in the 8th part?
  2. scruffytr
    scruffytr
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    Unknown if I hit a glitch or not, but I'm unable to enter the sewer hatch following the initial first visit to the snake cave.
    1. leehom857
      leehom857
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      ME TOO.,i can not enter the snake cave after i was saved  by the other although i have bought the rope   
    2. outlawzgosu
      outlawzgosu
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      i tried it the next day and it worked.