It reached at its base and you heard its sound.
Sahih Muslim Book 53, Hadith 37
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We were in the company of Allah's Messenger (ﷺ) that we heard a terrible sound. Thereupon Allah's Apostle (ﷺ) said: Do you know what (sound) is this? We said: Allah and His Messenger know best. Thereupon he said: That is a stone which was thrown seventy years before in Hell and it has'been constantly slipping down and now it has reached its base.
Sahih Muslim Book 53, Hadith 36 Next Hadith → There will be some to whose ankels the fire will reach, some to whose knees, some to whose waist the fire will reach, and some to whose collar-bone the fire will reach.
Sahih Muslim Book 53, Hadith 38
Sahih Muslim Book 53, Hadith 36 Next Hadith → There will be some to whose ankels the fire will reach, some to whose knees, some to whose waist the fire will reach, and some to whose collar-bone the fire will reach.
Sahih Muslim Book 53, Hadith 38