Thank you for enjoying our game!
I'm not entirely sure if you meant this, but there is a sound that plays from the sonar. The sound is actually just a wind chime. I thought it would be a good fit since could help calm the mood of the game since I was worried it would feel too "horror". I also liked how angelic it sounds.
I added a bit of fade out as the sonar shrink, and some reverb, but this is the original sound: https://freesound.org/people/Sllarson/sounds/342185/