text: Ele ? ­ vators take you 100 m ( 328 ft ) down to a sub ? ­ ter ? ­ ra ? ­ nean river for a spooky boat ride past gigantic stalactites and stalagmites , formed by the calcite residue and deposits of thousands of years of persistently dripping water .
  
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  There are stalagmites formed from thousands of years of drippings .