وَإِذْ فَرَقْنَا بِكُمُ الْبَحْرَ فَأَنْجَيْنَاكُمْ وَأَغْرَقْنَا آلَ فِرْعَوْنَ وَأَنْتُمْ تَنْظُرُونَ
The second stage is this passage speaks of Allah diving the ‘sea’. This sea given the context of 2/49 is the society of firaun itself which he ‘yasum’ (2/49). Allah divided that sea and saved bani israil with it. bani israil were prime witnesses to this dramatic incident.