Ross our helicopter pilot had to get into the caldera without passing through the gases coming out of the main crater which would have caused extreme turbulence to the small Robinson copter. After securing the main rotor we tramped over the lunar landscape to the sulphur laden crater grabbing our respirators as particularly bad emissions wafted our way. Before returning to base we passed through the heavily corroded remains of the sulphur extraction plant built in the 1920's and subsequently overwhelmed by eruptions.
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