Mt. Erebus Antarctic expedition 2007 - Image 43 of 58

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Some cave entries are very subtle and hard to spot. But the benign appearance is deceiving – the cave underneath this entrance is 30 metres deep and several kilometres long. Because of its constant air draft inside it was named “wind cave”. When getting close to the entrance, scientists must be very concentrated and secured with ropes – at some places the cave’s roof is only a few centimetres thick.