 That distant and small spot in the cosmos is the habitat of approximately more than two million species and the product of billions of years of evolution. Most of this biodiversity is in the soil beneath our feet, but only one percent of soil species have been identified so far. The soil biota constitutes the greatest concentration of biomas of any part of the planet and is composed of an immeasurable amount of mega, macro, meso and microorganisms. Each of these wonderful creatures plays a key role in the food chain that maintains the fragile balance of life in natural and agroecosystems. If these complex interactions become interrupted, it can cause irreversible impacts for life on Earth, including humans. So, why do we need soil biodiversity? Soils hold many unexpected secrets and perform unseen functions, but discovery of antibiotics has had a major impact on increasing human life expectancy. Soils hold many other potential medicinal functions and possible cures. The natural association between plant roots and microscopic fungi promotes better plant nutrition and growth, tolerance to soil pathogens and adverse climatic conditions. Through the natural function and metabolism, soil microorganisms are capable of breaking down and denaturing certain toxic compounds and contaminants resulting from many human activities. Part of CO2 emissions into the atmosphere, derived from industry and agriculture, can be absorbed by plants and stored in soils thanks to microbial decomposition that may allow soil carbon retention for long periods of time. This invaluable service provided by soil organisms is key in climate change mitigation. On the other hand, deforestation, monocultures, and the overuse and misuse of agrochemical inputs degrade and reduce soil's health, diminish resistance to pests and pathogens and cause biodiversity loss that jeopardize a delicate balance that took billions of years to evolve and specialize. We could not only lose a long natural history of speciation, specialization, evolution and adaptation, but also soil's capacity to perform essential ecosystem functions. We restore, manage and conserve something that we do not see directly, and of which we do not have full knowledge. It is our collective responsibility to raise awareness on the importance of soil biodiversity, promote technological innovation to preserve and enhance soil biodiversity, including ecosystem restoration, recognize soil biodiversity as a key provider of ecosystem services, and as one of the main nature-based solutions to face all the current global challenges, invest in gathering better knowledge about the status of soil biodiversity and functions, including by region and land cover type, and develop policies based on scientific evidence to mainstream sustainable soil management and conservation of rich biodiversity soils across landscapes. Everything that we eat and drink passes through the soil biota over and over again. Therefore, we need healthy soils for healthy food, healthy environments, healthy people and a healthy life. It starts with you. Give a voice to the sound of a living soil. Keep soil alive. Protect soil biodiversity.