I don't see that working real well. After the methane bubbles pop, the methane spreads out widely. Before the bubbles pop, the bacteria would not quickly / ea

I don't see that working real well. After the methane bubbles pop, the methane spreads out widely. Before the bubbles pop, the bacteria would not quickly / easily get to where the methane is actually concentrated. They don't just dig for resources, they have to ride along with some other process (like water flow).