Leyland Cecco, The Guardian

Video footage from a deep-sea mining test, showing sediment discharging into the ocean, has raised fresh questions about the largely untested nature of the industry, and the possible harms it could do to ecosystems as companies push to begin full-scale exploration of the ocean floor as early as this year.

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Critics have long feared the plumes of sediment created from extraction could seriously harm marine ecosystems by limiting light penetration and releasing harmful toxins. “We don’t know what the consequences of those problems were under the surface of the sea,” said Coumans. “We’re only seeing the tip of the iceberg. We’re not getting transparency.”

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