Underwater acoustic recorder "SoundTrap" that records sounds in the sea, etc. | Information dissemination media for R & D TEGAKARI
Try This Underwater Muffle Sound Effect | SUPER FAST | Premiere Pro Tutorial - YouTube
MUFFLED/UNDERWATER AUDIO EFFECT - HitFilm Pro Tutorial - YouTube
6 Creative Audio Effects in Adobe Premiere Pro — Premiere Gal
6 Creative Audio Effects in Adobe Premiere Pro — Premiere Gal
Underwater Audio
Underwater Effect for Voice and Underwater Sound Effect
Underwater - FX Plugin by Thenatan - Underwater Effect Plugin VST VST3 Audio Unit
This might be common knowledge, but you can open your sound files in a program like audacity and add a low-pass filter and reverb effect to create a quick and cheap underwater
6 Creative Audio Effects in Adobe Premiere Pro — Premiere Gal
How To Make A Underwater or Muffle Sound Effect With Android (read description) - YouTube