Ice caves carved deep into a glacier look like an alien world.
Photographer James Rushforth explored the caves in the Breiðamerkurjökull glacier that flows down off the Vatnajökull ice cap in Iceland.
The magical-looking caves, carved by summer melt-water that flows through the glacier, can only be accessed between November and March, when the weather has been cold enough to solidify the caves and make them safe to crawl through.
Mr Rushforth, 32, said: "Walking inside and under a glacier is an alien and magical experience.
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