Jonah 2:5-6 
Mountains exist at the bottom of the sea

(950 BC or earlier)

5 The waters compassed me about, [even] to the soul: the depth closed me round about, the weeds were wrapped about my head.
6 I went down to the
bottoms of the mountains; the earth with her bars [was] about me for ever: yet hast thou brought up my life from corruption, O
LORD my God.