

Journeying to the Hadal Zone in a two-man submarine
Oct 7, 2025
Dr. Todd Bond, a marine ecologist and Deputy Director at the Minderoo-UWA Deep-Sea Research Centre, takes listeners on an exhilarating journey to the mysterious Hadal Zone, over 6,000 meters deep. He shares captivating details about his titanium submersible, the challenges of deep-sea exploration, and the strange, often colorful life forms encountered. Todd also discusses human impacts on these extreme environments, the astonishing behavior of creatures like pufferfish, and the urgency of studying and protecting the ocean's depths before species vanish forever.
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Deep Ocean Access Is Recent But Repeatable
- Humans only reached the deepest ocean (Challenger Deep) much later than moon landings, but repeated visits are now possible.
- A few specialized submersibles can return regularly to the deepest trenches for science.
How Scientists Define 'Deep' Ocean
- Over 70% of the ocean is deep, but definitions vary; Todd considers deep sea >1,000m and 'real deep' >3,000m.
- The Hadal Zone is defined as depths of 6,000 metres and deeper.
Riding Inside A Titanium Sphere
- The two-person sub is a titanium sphere made of 9cm-thick hemispheres with tiny iPhone-sized portholes.
- You sit inside the sphere, use the portholes to view, and deploy weights to float back to the surface.