>>9587368

>>9587978

>The hole runs deep

>>9588026

South China Sea Blue Hole Could Be World's Deepest

https://www.scientificamerican.com/article/south-china-sea-blue-hole-could-be-world-s-deepest/

>>9588048

Dragon Hole, or Longdong, is 987 feet

>>9588086

Dragon Hole is mentioned in the Ming dynasty novel "Journey to the West," in which a supernatural monkey character gets a magical cudgel from an undersea kingdom ruled by a dragon.