Episode Description

Could humans really breathe liquid? Could we actually live hundreds of meters beneath the ocean—and what might be waiting for us in the unexplored deep?

 In this episode of UNOBTAINIUM, hosts Amy and Adam “dive” into the science behind James Cameron’s 1989 sci-fi classic THE ABYSS with Dr. Tina Treude, UCLA professor and expert in marine geomicrobiology.

The biggest mystery of all is how much of the deep ocean have we actually explored. Scientists continue to encounter species they’ve never seen before, reminding us that some of the most alien environments we know of are right here on Earth. James Cameron imagined an alien world at the bottom of our own ocean. The remarkable thing is how alien the real one already is.

Hosts Dr. Amy Mainzer and Adam Sigel welcome guest Dr. Tina Treude, a UCLA professor of marine geomicrobiology. They analyze James Cameron's 1989 sci-fi film The Abyss, noting its accurate depiction of deep-sea pressure dynamics.

• Gas Solubility & The Bends: Under high pressure, gases like nitrogen dissolve faster into a diver's bloodstream. Rapid ascents cause dissolved nitrogen to form gas bubbles, causing decompression sickness ("the bends"), which can block nervous system connections and prove fatal.
• Decompression Protocols: To avoid decompression sickness, technical divers entering high-pressure environments must undergo controlled decompression in chambers—often lasting days or weeks—to allow nitrogen to slowly diffuse out of the body.

2. The Science of Liquid Breathing

The famous scene where a rat breathes oxygenated fluorocarbon fluid reflects real scientific experiments.

• Mechanism & Benefits: Breathing oxygenated fluorocarbon emulsion prevents lung collapse at extreme depths because liquids are incompressible under pressure.
• The Physical Limitation: While fluorocarbons can deliver adequate oxygen to the lungs, human respiration with liquids is bottlenecked by fluid viscosity and CO2 removal. Moving dense fluid in and out of the lungs requires tremendous physical effort, making long-term human fluid breathing impractical due to CO2 retention.

3. High-Pressure Effects & Saturation Diving

• Nitrogen Narcosis: Diverging from decompression sickness, nitrogen narcosis occurs at depths typically below 40 meters (120 feet), where nitrogen exerts an intoxicating, narcotic effect on neural synapses.
• Ambient Pressure Habitats: The underwater station depicted in The Abyss operates at ambient sea pressure. Divers can enter and exit through an open moon pool without immediate pressure changes because the internal gas pressure matches the external water pressure.
• Submersibles & ROVs: Dr. Treude notes that while human industrial diving peaked around 300 to 500 meters, modern deep-sea research relies heavily on Remotely Operated Vehicles (ROVs) to mitigate safety risks.

4. Marine Biology & Deep-Sea Ecosystems

• Oxygen Limits in Deep Waters: Dissolved oxygen levels in seawater are roughly 40 times lower than in air. Marine life compensates with high-surface-area external gills and continuous water flow rather than internal lungs.
• Bioluminescence: Deep-ocean organisms generate light through enzymatic reactions or bacterial endosymbiosis for communication, hunting (e.g., anglerfish lures), and camouflage.
• Chemosynthesis & Extremophiles: Geothermal heat at hydrothermal vents can support unique microbial life, highlighting ecosystems that thrive entirely independent of surface sunlight.

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For Dr. Tina Treude

https://faculty.epss.ucla.edu/~ttreude/

https://www.ioes.ucla.edu/person/tina-treude/

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