под нужным углом(The cave, which doesn't yet have an official name, has an entrance in a pit that's the size of a football field and descends an estimated 600 feet (183 meters) down into the Earth. (...) Canadian wildlife researchers had flown over the site before, but somehow hadn't seen the enormous pit. Pollack speculated that it may have been obscured until recently by the area's typically heavy snow cover, which has been gradually dissipating because of climate change. "It could be that the snow camouflaged enough, until maybe you had a low snow year, or a low avalanche year, and you flew over it at the right angle to see it," he says.howstuffworks.comART Vancouver)
