Three weeks after the last humans departed from NASA Haughton Mars Project Base Camp on Devon Island, the Arthur Clarke Mars Greenhouse continues to operate – by itself. Its operations are monitored and controlled via satellite by researchers in Canada and the United States. Inside, a small crop of lettuce plants continues to grow. The two webcam images shown above demonstrate the rate at which the lettuce crop is growing. Taken just 5 days apart, all plants show a signficant increase in size.