A new study published in *Science* reveals the immense scale of Earth’s subterranean fungal network. Researchers found that if laid end-to-end, the total length of these fungal threads, known as hyphae, would stretch across approximately 10% of the Milky Way galaxy. This vast network plays a crucial role in connecting plants and facilitating nutrient exchange within ecosystems. The findings highlight the significant, yet often unseen, impact of fungi on terrestrial life. Scientists emphasize the importance of understanding this network for conservation efforts and comprehending global ecological processes. The study underscores the interconnectedness of life on Earth and the surprising scale of biological systems. Further research will focus on mapping and analyzing the full extent of this underground web.