spelunker

1. 洞穴探险爱好者
   A spelunker is someone who goes into underground caves and tunnels as a leisure activity.

in BRIT, use 英国英语用 potholer

1. She enjoyed it partly because'it's not very touristy,'she said while removing the spelunker's helmet that visitors must don.
   她一边摘下游客必须佩带的洞窟探险头盔一边说，她享受这次旅行的部分原因是它的旅游味儿不是那么浓。
2. The Arakyd Spelunker probe droid was typical of such units, equipped with a sophisticated sensor array that could detect precious ores.
   阿拉基德公司的“勘探者”机器人便是其中的典型。它们配备有高精度传感器，可以发现稀有矿藏。

noun

1. a person who explores caves

   Synonym:    potholerspeleologistspelaeologist