2000
Around the turn of millennium I developed a vocal style which I labelled as "sewer vocals" (as it sounded like some imagined creature living in the sewers). Sang while breathing inwards. The vocal style was inspired by 1) zombie movies and 2) early Fallout games (which have ghouls living underground).
This song is a good example of the sewer vocal style as it gets going. The vocalstyle became pretty much a trademark in metal tracks by Aeuk (when it was Aeuk himself singing) - it was unique vocal style if nothing else.