Forget the internet, there's a hidden superhighway under your feet, and it's almost a billion Sun trips long and scientists have now mapped this underground fungal network for the first time. The study shows that these fungal networks stretch about 110 quadrillion kilometers across Earth. They help plants obtain nutrients and water, move around 4 billion tons of carbon dioxide into soils each year, and support ecosystems. Researchers say the findings could help conservation efforts, climate planning, and future studies of underground biodiversity.