i have read this website before. it seems as if the point is to scare the unbeliever into accepting jesus. this strategy im sure has brought many to jesus, but not under love. do i believe the sounds are from hell? no. are they from the center of the earth? satan is powerful in his deception, so i believe these sounds possibly exist. people have reported ghosts, aliens, demons, etc. if satan is the ruler of this world, then if his authority extends to making sounds, then i believe he will exercise that authority to the deception and destruction of believers and non believers. thank god, though, that he draws us by his spirit of love and hope toward salvation.