Hidden song in the Shallows?

[JMart]

Okay, I think I'm going mad because I can't find any evidence of this online. But after I beat Nephro and Slacktide was in its gunked-up state, there was a cool different song playing in The Shallows that had lyrics, with a woman singing. It switched over to the distorted "Fort Slacktide?" music after going through the gate, but I heard it a couple times in that area by the vending machine before it started only playing the regular Shallows music instead. And I can't find the song in the OST or anyone else talking about it online. Does anyone know what's going on here? I just beat the game and almost want to start a new file just to see if this happens again.

[Vakma]

I Believe the song is "The Shallows" the theme for the shallows, it has some vocalization as well as the woman counting at the start of the song. Perhaps that is the one?