# Hydrothermal Vents > Hot water from deep underground. - Field: Geology - Level: Advanced - Qur'an passage: Quran 81:6 - URL: https://dailymuslim.org/quran-miracles/hydrothermal-vents 1400 years ago nobody knew that oceans are being heated however this was portrayed in the Quran. Geysers are one type of hydrothermal vents. They gush hot water from deep underground. Oceanographers found hydrothermal vents at the bottom of the ocean gushing hot water at more than 400 ºC. > A vent site in the Cayman Trough named Beebe, which is the world's deepest known hydrothermal site at ~5,000 m (16,000 ft) below sea level, has shown sustained supercritical venting at 401 ºC (754 ºF) and 2.3 wt% NaCl. — [Wikipedia, Hydrothermal Vent, 2018](https://en.wikipedia.org/wiki/Hydrothermal_vent) 1400 years ago people could only have seen geysers at the surface but nobody could have seen this at the bottom of the ocean. However the Quran says that the oceans are being heated. ## Qur'an passage · Quran 81:6 ٦ وَإِذَا الْبِحَارُ سُجِّرَتْ *And if the oceans were heated.* Sujirat "سُجِّرَتْ " in Arabic means heated. Well is 400 ºC hot enough? ### Additional references > Original article: Miracles of Quran, shared under the source website’s no-copyright notice. The linked scientific and interpretive notes below are separate additions. — [Miracles of Quran — About Us](https://www.miracles-of-quran.com/about.html) ### Wikipedia — reuse licence > The original article’s quoted hydrothermal-vent passage remains attributed to Wikipedia. Wikipedia text is reusable under the Creative Commons Attribution-ShareAlike 4.0 licence, subject to its terms. — [Wikipedia — reuse licence](https://creativecommons.org/licenses/by-sa/4.0/) ### Additional evidence — summary > NOAA explains that seawater descends through cracks in oceanic crust, is heated by magma, and rises again through hydrothermal vents. Vent water may exceed 400°C, while the enormous pressure of the deep ocean prevents it from boiling. This directly supports the physical fact that very hot water emerges from the ocean floor. — [NOAA Ocean Exploration — Hydrothermal Vents](https://oceanexplorer.noaa.gov/wp-content/uploads/2022/10/hydrothermal-vents-fact-sheet.pdf) ### Woods Hole Oceanographic Institution — hydrothermal vents > Woods Hole likewise reports that hydrothermal-vent fluids can reach about 400°C and that most vents occur along mid-ocean ridges. Scientists first discovered deep-sea hydrothermal vents near the Galápagos in 1977. That discovery date supports the modern scientific history, though surface hot springs and volcanic heating were known much earlier. — [Woods Hole Oceanographic Institution — hydrothermal vents](https://www.whoi.edu/ocean-learning-hub/ocean-topics/how-the-ocean-works/seafloor-below/hydrothermal-vents/) ### Quran.com and classical tafsir — context of 81:6 > Quran 81:6 appears in a passage describing the events of the Day of Judgment. Modern translations render سُجِّرَتْ as the seas being ‘set on fire,’ while classical explanations also record meanings such as filled, overflowed, dried up, or kindled. Hydrothermal vents are real scientific evidence of intense heating beneath parts of the seafloor, but identifying them as the intended meaning of this verse is a modern reflection, not a conclusion established by geology or the classical tafsir. — [Quran.com and classical tafsir — context of 81:6](https://quran.com/en/81%3A6/tafsirs/ar-tafsir-al-tabari) ## Ponder **How could an illiterate man who lived 1400 years ago have known that oceans are being heated?** ## Sources and further reading - [Quran 81:6 · Quran.com](https://quran.com/81/6) - [NOAA Ocean Exploration — Hydrothermal Vents](https://oceanexplorer.noaa.gov/wp-content/uploads/2022/10/hydrothermal-vents-fact-sheet.pdf) - [Miracles of Quran](https://www.miracles-of-quran.com/hydrothermal.html) — Miracle of Quran, Daily Muslim · https://dailymuslim.org/quran-miracles/hydrothermal-vents