There is tremendous amounts of hydrogen sulfide coming into this cave from volcanic sources and from the breakdown of evaporite -- minerals below the carbonates in which this cave is formed -- and it is a completely hostile environment for us.
火山やこの洞窟を形成する 炭酸塩のミネラル分である 石膏の分解により 大量の硫化水素が洞窟内に流入し 非常に過酷な環境です