Surah Al-Kahf — Ayah 41 (18:41)
أَوۡ يُصۡبِحَ مَآؤُهَا غَوۡرٗا فَلَن تَسۡتَطِيعَ لَهُۥ طَلَبٗا ٤١
English translation (Saheeh International)
Or its water will become sunken [into the earth], so you would never be able to seek it."
Brief commentary
Or its water may sink so deep into the ground that you will never be able to reach it again in any way. Once the water sinks deep, the garden will not survive.