Scientists are exploring the possibility of life deep beneath the surface of Mars by accessing the Martian subsurface. They believe that liquid water may exist underground, which could support life. To investigate this, they are considering two missions to penetrate to depths of around 300m and 3km. One potential method involves using an electrically heated probe to melt through rock and collect samples. This approach could reduce the need for heavy drilling equipment and minimize contamination risks. Deep drilling on Mars raises concerns about handling samples on the surface and upon return to Earth.