Descent (2005)

When the Ring of Fire starts heating up with an unprecedented amount of volcanic activity a team of scientists are gathered to prevent a global catastrophe. But one of the scientists realizes early on that the cause of volcanic reactions is most likely due to a secret government operation investigating alternative energy resources from deep within the Earth's mantel. So even though the mission is designed to save the planet, someone has to make sure the government's involvement remains a secret. —Sci-fi guy