Well, apparently, "We Rave You" blog made a mistake (check the comments here
https://instagram.com/p/8vWsEzwGy4/) Underwater is another song. All these rumours probably started because of this video
https://www.youtube.com/watch?v=uVn_8a49Mc4 If you just read the video title and listen to the song played, not paying atention to the video itself or to the description, you will probably think the song played is their colab, but in the playlist showed in the Tiesto's CDJ screen, Underwater was the next track to be played, not the currently playing
