É Verdade que só Conhecemos 5% dos Oceanos?

Fontes: 

• https://www.scientificamerican.com/article/just-how-little-do-we-know-about-the-ocean-floor/
• https://www.scientificamerican.com/article/best-view-ever-of-hidden-seafloor-revealed-in-new-images-slide-show/