In general caving expeditions try to contact local authorities, especially town government and offer speeches where they explain to the locals what they intend to do. Also it has become a custom to invite locals to join the expedition, if they are physically fit enough. There are far less legends and rumours if locals witness their work. There was a case in Mexico where a group of cavers which were also members of the British army were "trapped" in a flooded cave. Actually they were inside the cave in no danger, but when they returned after a week unharmed, the flood had made international news and speculations about the British Army invading Mexico, stealing gold treasures and installing top-secret underground army bases, had made international news. As a result foreign cavers were banned for years, then had to apply for permits before entering the country. As a result any international caving expedition does now do a lot of awareness-raising for the locals.