Mr. Brightside Lyric?

On The Killers song Mr. Brightside, there is a lyric that my friend and I have been arguing over for months now. When the lead singer, Brandon Flowers, sings "Jealousy, turning saints into the sea. *unknown* through sick lullabies. choking on your ........" What is the *unknown* word? I hear Swimming while my friend hears churning.