spelunker       
noun [ C ] US uk/spəˈlʌŋ.kər/ us/spəˈlʌŋ.kɚ/ (UK potholer)
 洞穴探查运动员
someone who walks and climbs in caves as a sport
  The Chauvet cave is named after the spelunker who discovered it in 1994. 肖维洞穴以 1994 年发现它的探险者命名。 
 I need one of those head torches that spelunkers wear. 我需要一个洞穴探险者佩戴的头灯。 
 Synonym: caver
See: spelunking
 - More examples
 - The cave is popular with spelunkers.
 - The state has asked cavers and spelunkers to avoid caves which may be bat habitats.
 - The spelunkers climbed through rocky tubes 40m underground.