She added: “Throughout it all there was that feeling of ‘what if nobody comes?’“I just kept feeling guilty for my family back in Stockton, in case I didn’t come back.”Jon Bonfiglio, who was leading the expedition, said the group had no idea what they were getting into when they set out.”We were not naive idiots going over a cliff edge,” he said.“We sat down with locals and talked to them about the river, but people told us there was only one waterfall, even the local people didn’t know of all the waterfalls or the perils. I had no inkling of what we were getting into.”Gibraltan Jon had to spend the entire five days in his underpants, having stripped off to jump into the water and help another member of the group into a boat after their capsized.He said: “I was virtually naked throughout the whole thing, I lost all my clothes and had to stay in my underpants.”It was like all the best horror films, it started beautifully, the river was meant to be placid and gentle, no one mentioned the rapids and waterfall.”They were eventually rescued by a man named “John of the Gods” who took them to a nearby home where they showered and rested. “My legs were all cut from the palm leaves and I had bruising on my bum from sleeping on a branch,” said Rachel who also had an eye infection but did not need to be hospitalised.“We ended up being a very close group,” added Jon. “No one shouted at each other but there was the unspoken, ‘What happens if they don’t find us today? What happens if they don’t find us tomorrow?’” A group of conservation workers have revealed how they spent five days stranded in a Mexican jungle, surviving on a handful of peanuts and raw fish after their boat capsized.A British member of the group, Rachel Bradley, 31, said to keep from starving they used mosquito nets to catch tiny fish and swallowed them whole after removing the heads.The group of four were on a river expedition through the Yucatan Peninsula in south eastern Mexico when their adventure went wrong. Jon Bonfiglio is the director of the Clipperton Project which takes explorers through some of the world’s most remote areasCredit:KTD Media Rachel said they were eventually rescued by a man called “John of the Gods” Credit:KTD Media Rachel said: “I had a couple of bags of peanuts left and we were forced to ration them to five peanuts a day.“We were forced to use mosquito nets to catch little fish that were no bigger than your thumb. We had to bite their heads off and swallow them whole.”Without basic supplies, they were forced to sip dirty river water and with the jungle submerged at that time of year, sleeping arrangements were made in tree branches.Rachel said: “We realised the best way of being found was just to stay still.“Lying in a tree for a couple of days wasn’t the plan when we went out, but we thought the safest place was just staying put and hoping someone could find us.” After hurtling over waterfalls and emerging each time covered in leeches, the explorers found themselves being pushed further and further into the heart of the 1.9million hectare jungle.“The water just kept flowing faster and faster,” said Rachel, from Stockton in Teesside. “But at this point it was too late to go back.”When two of the four boats flipped over and were lost, their food, first aid equipment and GPS navigation system also vanished.The group anchored the remaining boats together using vines to stop them floating off and examined the food they had left. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.