Mount Paektu growing unrest: major eruption 1,000 years ago, unleashed energy equal to 1 million atom bombsMt. Baekdu, (Mount Paektu ) the symbolically charged volcano straddling North Korea and China, could erupt again soon, a study warns. Professor Yoon Sung-hyo of Pusan National University says there are indications that the volcano, though quiet for decades, could erupt any time and urged closer monitoring of the situation. The last eruptive activity at the volcano occurred in 1903, though prior past eruptions were among some of the largest in recorded history. He says the concentration of helium in the volcano has been rising over the last decade or so, and magma levels are creeping up. Yoon has been warning of another eruption since 2010, the first Korean to add his voice to a growing chorus of regional seismologists.  A volcano responsible for one of the most violent eruptions in history is showing signs of life. Scientists know little about Mount Paektu because most of the mountain lies in North Korea, one of the world’s most secretive countries. But for the first time, Western scientists have been allowed to study this sleeping giant, given extraordinary access to determine if — or when — it could wake up, reports CBS News correspondent Seth Doane. “It was quite a special experience the first time,” said British vulcanologist James Hammond. “Very much a voyage into the unknown.” MORE