Concise Quran 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.
Tafsir for this Ayah
Surah 18 : Ayah 41
Surah 18 : Ayah 41
أَوْ يُصْبِحَ مَآؤُهَا غَوْرًا فَلَن تَسْتَطِيعَ لَهُۥ طَلَبًا
Or its water may sink, so you will never be able to get it back.”