Subnautica - missing soundtrack?!

[Ghatotkacha]

Hey guys!

So i'm playing Subnautica awhile now, and there's a specific OST what i cannot find at the original OST files - when i enter to the Active/Inactive Lava zone, or to the Lost River, there's a really down tempo sountrack, with pulsing sounds, grave-like undertone vocals and the whole result is highly claustrophobic...which totally fits at the actual situation. :)
I did not find it anywhere at YouTube, nor at any of the soundtrack finding discussions here at Steam.

Do you anything maybe about this song?

My hope is in your hand, guys. :)

Cheers!

[Phaota]

It's in your Steam/SteamApps/Common/Subnautica folder.

[Ghatotkacha]

Dear Phaota,

I know this folder, it contains a lot of OST, but not this one. I listened the whole OST back and forth, and nothing...