South Dakota’s Underground


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Location: ? Jim River Valley South Dakota
Functions: Unknown
Levels: Unknown
Tunnels to: Unknown
Notes:   “A Vast Underground Lake” discovered below the Jim River Valley which spans the borders of both states.
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Location: Black Hills South Dakota
Functions: Unknown
Levels: Unknown
Tunnels to: Unknown
Notes:  Plans for a large underground scientific laboratory within a large gold mine in the Black Hills.
Source:  


Location: South Dakota
Functions: Unknown
Levels: Unknown
Tunnels to: Unknown
Notes:  
Source:  

Related:  Florida's Underground

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