bedrock2_step.1.ogg - from the Bedrock mod by Wuzzy, https://repo.or.cz/w/minetest_bedrock2.git, under the WTFPL, relicenced to MIT for this mod. bedrock2_step.2.ogg bedrock2_step.3.ogg dfcaverns_grinding_stone.1.ogg - from https://freesound.org/people/FreqMan/sounds/25845/ by FreqMan under Creative Commons BY 3.0 dfcaverns_grinding_stone.2.ogg - from https://freesound.org/people/FreqMan/sounds/25846/ by FreqMan under Creative Commons BY 3.0 dfcaverns_grinding_stone.3.ogg - from https://freesound.org/people/FreqMan/sounds/25847/ by FreqMan under Creative Commons BY 3.0 dfcaverns_arcing.1.ogg - from https://freesound.org/people/unfa/sounds/264827/ by unfa under Creative Commons BY 3.0 dfcaverns_arcing.2.ogg - from https://freesound.org/people/unfa/sounds/264827/ by unfa under Creative Commons BY 3.0 dfcaverns_arcing.3.ogg - from https://freesound.org/people/unfa/sounds/264827/ by unfa under Creative Commons BY 3.0 dfcaverns_arcing.4.ogg - from https://freesound.org/people/unfa/sounds/264827/ by unfa under Creative Commons BY 3.0