Aheadline sounds the most credible when it:

Headlines sounds credible if the writer will be using the question, is reading this article be beneficial for me. Using this question, the headline sounds credible and audience will have the curiosity to read the article. Also having a good headline makes the reader attracted to read it. so if your looking for something shorter its Formal language

It is clear, formal, and familiar

Explanation:

A convoluted headline is often just ignored or taken as unlikely. We can see many examples of it during the politically invested election times. Formal statement sound more believable because they sound like they have gone through a professional procedure before being publish. And familiar things are believable because everybody can believe that something that they know to have happened one before has happened again, even if it's unlikely to.

i really dont know

explanation:

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.