The oceans cover 71% of the planet, yet they remain as one of the greatest mysteries. This is because reaching the bottom of the ocean safely presents a greater challenge than reaching the moon. From the corrosive quality of sea water to the intense pressures at great depths, exploring the oceans has been one of the most extreme challenges to technology that mankind has ever encountered.
Scientists and the military have the greatest motivations for exploring the abyssal regions of the planet. The scientists seek to understand the strange life forms that live in the greater depths as well as uncovering geological mysteries. The military have interests ranging from espionage to missile deployment. In this episode, we get a glimpse a various technologies created for scientists and military to explore the depths.