Deep-Sea mining could quickly destroy marine ecosystems for profit

Written by: Leo A. on 9 September 2024

(Above: Capitalism is not interested in nodules’ oxygenating of the seas, but only in those components that grease the wheels of private profit. Image from Flickr Commons) 

It is common in our current time that the pursuit of profit will irreparably damage or destroy a unique ecosystem before it can be protected, or before it has even been properly studied. Of all Australia’s ecosystems, the least studied by far is the deep sea which surrounds our nation’s coasts. Over a third of the seafloor within Australia’s Exclusive Economic Zone has yet to be mapped, and globally this figure is even higher. 

Much of the abyssal seafloor is covered in polymetallic nodules. These are pebble-like objects containing large amounts of manganese and other metals. A deep-sea mining industry based on the harvesting of these nodules is already inching toward production. Tests conducted in the 1980s showed that collecting them off the seafloor can be accomplished on a large scale – and the sections of seafloor harvested by these tests are still “dead zones” to this day. 
 
This is because the nodules aren’t just rocks. A research study published in late July has shown that they play a critical role in keeping the deep sea habitable for its wildlife. Specifically, the nodules produce oxygen in the water which deep-sea organisms consume. It appears that this is due to the high voltage potentials of the nodule surfaces, which cause seawater electrolysis. In other words, the nodules split small amounts of the surrounding water into hydrogen and oxygen, the latter of which “dissolves” back into the water. This allows the environment to stay oxygenated without the need for photosynthesis. 
 
Now imagine what will happen if this vital component of the abyssal ecosystem is harvested en masse. Without enough dissolved oxygen in the water, marine animals could suffocate to extinction. Many of these could go extinct without ever being discovered at all. Australia has more abyssal seafloor in its territory than almost any other nation, and so it is critical that we make the efforts necessary to protect our deep-sea environment, before greedy capitalists destroy it for a profit. 

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