Does Mars Methane Indicate Life Underground?

Information/data obtained by the Mars Express probe indicate water vapor and methane gas are concentrated in the same regions of the Martian atmosphere, according to the European Space Agency. This is important because there is evidence suggesting that microbial life could exist on Mars. If microbes are making methane in the Martian atmosphere as part of their living process, they would rely on water. Other scientists disagree however. They argue that the new methane measurements are real and statistically valid. Even if there is evidence of methane gas and water vapor, they could easily be explained by other processes. However, there is a possibility that the methane is produced by organisms called methanogens, which are microbes that produce methane as a waste product of their life process. The gas would be released to the surface and into the atmosphere.