Somewhere I have seen a quote that the total mass of microbes on and below the surface of the earth exceeds the total mass of all the more complex living beings. So if we want to ask the question: is there life on Mars, we shall have not to scratch the surface but drill beneath to see if there is life now there.
So if we want to ask the question: is there life on Mars, we shall have not to scratch the surface but drill beneath to see if there is life now there.”
Drill, baby, drill!