The environment was similar to old mines on Earth that are contaminated with sulphur and acid, says Jeffrey Kargel of the US Geological Survey in Flagstaff, Arizona.

• 隶属位于亚利桑那州弗拉格斯塔夫的美国地质调查局的地质学家杰弗里·卡苟说，那里的环境与地球上被硫磺和酸性物质污染的古老矿井类似。