When inventive Corin tweaks his grandfather's drilling rig into a transparent soil core viewer, he and his friend Ayla unveil a hidden universe beneath their feet. Lowering their high-tech capsule, they witness earthworms aerating loam, clay layers preserving ancient pollen, and gravel beds channeling groundwater. Using homemade tensiometers and litmus strips, they chart moisture and pH—revealing how soil governs which plants thrive. When nearby construction begins to compact precious topsoil, Corin and Ayla present their stunning footage at a town council meeting, inspiring new protections. "Journey Under Soil" invites readers ages 5–10 to explore the dynamic world beneath each seed, stream, and soul.