@rixty_dixet you should link to the original article, not this click-bait half-assed piece of "journalism". In the article you linked there are 2 mistakes:

1. It is not a dried-out ancient lake. It a formation that looks like a dried-out lake bed.
2. It is not under thousands of kilometers of sea... It's thousands of meters.

These are certainly not critical mistakes, but show the sloppiness and incompetence of whoever wrote the article.