Free Sub Drops & Impacts - original CC0 recordings

PF_SubterraneanDrops_Impact_19_Punchy.wav
  https://freesound.org/people/cabled_mess/sounds/339694/ by cabled_mess (CC0-1.0)

PF_SubterraneanDrops_Impact_04_Hard.wav
  https://freesound.org/people/Breviceps/sounds/464839/ by Breviceps (CC0-1.0)

PF_SubterraneanDrops_SubDrop_07_Deep.wav
  https://freesound.org/people/uzerx/sounds/63138/ by uzerx (CC0-1.0)

PF_SubterraneanDrops_SubDrop_12_Hard.wav
  https://freesound.org/people/Ev-Dawg/sounds/337525/ by Ev-Dawg (CC0-1.0)
