Archive · 19 May 2025
Deep Seafloor Mostly Unexplored, Study Finds
Imagine the deep ocean as a giant, unexplored wilderness.
Scientists have been exploring it, but it turns out they've only looked at a tiny, tiny bit of it!
Researchers looked at all the places where scientists have taken pictures and videos deep underwater.
They found that we've only seen about 0.001% of the deep seafloor.
That means we know almost nothing about most of the deep ocean.
Also, most of the exploring has been done by just a few countries.
The scientists say we need to find new ways to explore the deep sea if we want to learn more about it.
Scientists assessed the extent of visual exploration of the deep seafloor.
Visual observations have covered at most 0.001% of the deep seafloor.
Most deep-sea dives have been conducted by only five countries.
Canyons and escarpments are over-represented in observations.
Researchers suggest a fundamental change is needed in deep-ocean exploration.
- Who
- Researchers from the U.S. and other countries conducted the study.
- What
- Researchers analyzed existing deep-sea visual dives to estimate the area of the deep seafloor explored.
- When
- The study analyzed records spanning 66 years.
- Where
- The deep seafloor, specifically areas 200 m or more below sea level.
- Why
- To quantify the unseen portion of the deep seafloor and identify geographic biases in exploration.
- Maximum seafloor coverage
- 0.001%
- Total visual coverage estimated over 66 years
- 3,823 km2
- Total visual coverage estimate
- 1,259 km2 to 2,130 km2
- Countries that conducted most dives
- Five countries (US, Japan, New Zealand, France, Germany)
- Number of countries involved in the study
- 14
- Number of records of deep-sea visual dives
- 43,681
- Exclusive economic zones where dives were conducted
- 120