When they are thrown into it, they hear from it a [dreadful] inhaling while it boils up.
The Saheeh International Quran Translation
إِذَآ أُلْقُوا۟ فِيهَا سَمِعُوا۟ لَهَا شَهِيقًا وَهِىَ تَفُورُWhen they are thrown into it, they hear from it a [dreadful] inhaling while it boils up.