Read Surah An-Noor 24:40: "Or [else, their deeds are] like the depths of darkness upon an abysmal sea, made yet more dark by wave billowing over wa..." Full Arabic text, English translation, and image generator.
أَوْ كَظُلُمَاتٍ فِي بَحْرٍ لُجِّيٍّ يَغْشَاهُ مَوْجٌ مِنْ فَوْقِهِ مَوْجٌ مِنْ فَوْقِهِ سَحَابٌ ۚ ظُلُمَاتٌ بَعْضُهَا فَوْقَ بَعْضٍ إِذَا أَخْرَجَ يَدَهُ لَمْ يَكَدْ يَرَاهَا ۗ وَمَنْ لَمْ يَجْعَلِ اللَّهُ لَهُ نُورًا فَمَا لَهُ مِنْ نُورٍ
Or [else, their deeds are] like the depths of darkness upon an abysmal sea, made yet more dark by wave billowing over wave, with [black] clouds above it all: depths of darkness, layer upon layer, [so that] when one holds up his hand, he can hardly see it: for he to whom God gives no light, no light whatever has he!