Aparadox is literary a device often used to

often used to emphasize or make readers think about important ideas

It is used to make you think and highlight information

the answer is emerged from.

orpheus descended to hades, the world of the death to rescue eurydice. no mortal had ever done this before him, he survived because he was protected by the gods. the word "underworld" gives us a clue, he emerged from it like a whale emerges form sea for exemple.