הֲ֭בָאתָ עַד־נִבְכֵי־יָ֑ם וּבְחֵ֥קֶר תְּ֝ה֗וֹם הִתְהַלָּֽכְתָּ׃
Hast thou entered into the springs of the sea? Or hast thou walked in the recesses of the deep? .
Read kabbalistic (mystical) interpretation of Job 38:16: and classical mystical sources.