Despite the importance of visual observation in the ocean, we have imaged a minuscule fraction of the deep seafloor.
Sixty-six percent of the entire planet is deep ocean (≥200 m), and our data show that we have visually observed less than 0.001%, a total area approximately a tenth of the size of Belgium.
Data gathered from approximately 44,000 deep-sea dives indicate that we have also seen an incredibly biased sample. Sixty-five percent of all in situ visual seafloor observations in our dataset were within 200 nm of only three countries: the United States, Japan, and New Zealand.
Ninety-seven percent of all dives we compiled have been conducted by just five countries: the United States, Japan, New Zealand, France, and Germany.
This small and biased sample is problematic when attempting to characterize, understand, and manage a global ocean.
How little we’ve seen: A visual coverage estimate of the deep seafloor, Science/AAAS
Astrobiology, Oceanography,
