Surah Al-Kahf (18:61)

فَلَمَّا بَلَغَا مَجْمَعَ بَيْنِهِمَا نَسِيَا حُوتَهُمَا فَٱتَّخَذَ سَبِيلَهُۥ فِى ٱلْبَحْرِ سَرَبًا

Then when they reached the meeting‑place of the two (seas), they forgot their fish, and it took its path in the sea as a tunnel‑like passage.