The scariest volcano experience that I had was also in Antarctica. The first time that I worked on the volcano I was there with a fairly large group of people, including a scientist who wanted to study gases that were coming out of the lava lake. To reach the lava lake, we first had climb down a steep face, using ropes, to reach the main crater floor. The lava lake was in an inner crater, another 3 or 4 hundred feet below that.