فَلَمَّا بَلَغَا مَجۡمَعَ بَيۡنِهِمَا نَسِيَا حُوۡتَهُمَا فَاتَّخَذَ سَبِيۡلَهٗ فِىۡ الۡبَحۡرِ سَرَبًا
So when both of them reached the junction of the two seas, they forgot their fish (there). So, that (fried fish came back to life and) made its way into the sea like a tunnel (and slipped off).