How do the Taylor Glacier bacteria produce their energy?

Question:

Life In/Under Glaciers:

Glaciers are moving masses of ice, snow, water, and debris that during a cold season slowly advance down mountain slopes much like a river of ice. As glaciers advance down along their paths, they push ahead, fracture rock, pick-up debris, and soil as they move over the terrain creating moraines. Moraines are the leftovers when the glaciers recede as they melt. With the lack of light penetrating glaciers, one might think that there is no life in or under them. We would be wrong.

Answer and Explanation: 1