The nearest proper road is a couple of miles away. The toilet is an energetic yomp down a steep slope and through the conifers. When it rains – and here on Dartmoor it really does pelt down – the only shelter is project supervisor Simon Hughes's old VW Golf. "It's started to smell like a dead dog," he says with a big grin.
Despite the tough conditions, Hughes and his team are relishing working on the Bellever roundhouse. "It's a great project for us," he says. "It's a chance to really try to find out what was going on here 3,500 years ago."
There are lots of roundhouses on Dartmoor (5,000 stone ones and more wooden ones that have rotted away without leaving any trace), but most were studied a century or more ago. They used to dig one a day then, rather than taking weeks over it as they do now.
So when two years ago a great storm felled a plantation of conifers at Bellever, disturbing the roundhouse's granite structure, archaeologists argued that they ought to have another look. It is an exciting project: only the second roundhouse to be excavated in the area in the last 20 years and a chance to learn more about the people who, at a time when the climate was much more clement than it is now, were able to live and work here.