Filmmaker Rachael Thornton joins Ocean Dragon, China's first mission to full ocean depth. Over five weeks, she faces deep-sea pressure, joining scientists on a high-risk journey seeking new life and, possibly, new resources. The cabin has the largest space and carrying capacity among crewed cabins worldwide. With only three aboard the submersible, what will crack first, the mission or its crew?

Filmmaker Rachael Thornton joins Ocean Dragon, China's first mission to full ocean depth. Over five weeks, she faces deep-sea pressure, joining scientists on a high-risk journey seeking new life and, possibly, new resources. The cabin has the largest space and carrying capacity among crewed cabins worldwide. With only three aboard the submersible, what will crack first, the mission or its crew?