Underneath-1.9.jar is a release file of the Minecraft mod Underneath for Forge, made for Minecraft 1.12.2. It was published on September 23, 2025 and is 38.4 MB in size. For the full description, screenshots and every other version, visit the Underneath mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
