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BQ 3A News > Blog > UK > My staff came upon ‘dark oxygen’ at the seafloor – now we’re looking to know the way it used to be made
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My staff came upon ‘dark oxygen’ at the seafloor – now we’re looking to know the way it used to be made

March 20, 2025
My staff came upon ‘dark oxygen’ at the seafloor – now we’re looking to know the way it used to be made
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Youngsters are at all times asking “Why?” As they enjoy issues for the primary time, it’s herbal to wish to to find out extra. However as kids develop into adults, they steadily brush aside one thing new that demanding situations their enjoy and working out.

That is what came about to me after I came upon a supply of oxygen manufacturing within the deep sea – however left out it for 9 years.

In 2013, I used to be undertaking experiments to measure seafloor carbon biking within the Clarion-Clipperton zone of the Pacific Ocean in 2013. I deployed a lander gadget (a remote-operated platform used to hold medical apparatus) to a intensity of four,000 metres and it got here again with bubbles within it. This used to be extremely bizarre, so two years later, after we returned to the similar website online, I took some optodes (oxygen sensors) with me.

Those are designed to measure oxygen intake, however as a substitute they have been appearing me oxygen manufacturing, the complete opposite of what I used to be anticipating. As a substitute of wondering why I used to be getting those effects, I pushed aside the studying as the results of a inaccurate sensor.

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We’re all taught from very early on in our training that oxygen is most effective produced thru photosynthesis and that calls for gentle – one thing briefly provide at 1000’s of metres beneath the ocean floor. It took me till 2021, after I measured oxygen manufacturing with a 2d approach, that I realised we’d discovered one thing remarkable: darkish oxygen – oxygen that’s produced with out daylight.

In the summertime of 2024, my staff and I revealed our findings within the magazine Nature Geoscience.

Professor Andrew Sweetman holds a managanese nodule.
Scottish Affiliation of Marine Science

The invention of darkish oxygen has shifted our working out of the deep sea and doubtlessly lifestyles on Earth. However we nonetheless don’t know evidently how this oxygen is produced, and to what extent, and if it is ecologically important to the deep-sea ecosystems the place it occurs.

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In our paper, we recommend that the supply may well be polymetallic nodules, rock-like formations composed of a lot of other metals, together with manganese, which is able to create variations in electric possible when interacting with seawater. We proposed that those may just produce a voltage enough to separate the seawater into hydrogen and oxygen. A brand new Chinese language find out about has simply proven that oxygen can doubtlessly be produced when those manganese nodules are forming.

Extra ‘why’ questions

This 12 months, due to investment from The Nippon Basis, we will be able to probe a few of these medical questions. If we display that oxygen manufacturing is conceivable within the absence of photosynthesis, this discovery would alternate the best way we take a look at the opportunity of lifestyles on different planets too.

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Certainly, we’re already in dialog with professionals at Nasa who imagine that darkish oxygen may just reshape our working out of the way lifestyles could be sustained on different ocean worlds like Enceladus and Europa, moons that experience ice crusts that restrict daylight penetration to the sea beneath.

We’re additionally within the technique of analysing the possibility of darkish oxygen within the central Pacific Ocean and growing purpose-built and independent landers, or rigs. This would be the UK’s first alternative to pattern beneath depths of 6,000m. Those automobiles will lift specialist instrumentation to depths of eleven,000 metres, the place the power is multiple tonne in keeping with sq. centimetre (that’s an identical to 100 elephants sitting on best of you).

graphic of underwater equipment used to find dark oxygen on seabed

A diagram of the purpose-built lander that Andrew Sweetman is sending to the deep ocean.
Scottish Affiliation of Marine Science

We will be able to examine whether or not hydrogen is launched all through the advent of darkish oxygen, and if it is used as an power supply for an strangely huge neighborhood of microbes in portions of the deep ocean. We additionally wish to to find out extra about how local weather alternate may have an effect on organic process within the deep sea.

This challenge is the primary of its sort to without delay discover those processes. My staff will be capable of find out about the deep seafloor into the hadal zone, a space which reaches 6,000 – 11,000 metres intensity and makes up round 45% of all of the ocean. This habitat, filled with deep ocean trenches, remains to be poorly understood.

The invention of darkish oxygen obviously has possible implications for the deep-sea mining business. Deep-sea mining would extract polymetallic nodules that include metals reminiscent of manganese, nickel and cobalt, which might be required to provide lithium-ion batteries for electrical automobiles and cell phones.

We don’t but know the way an business reminiscent of this may have an effect on the seabed, however our analysis over the approaching years must assist to reply to lots of the questions posed and in all probability higher tell the place the seabed must be extra safe from deep-sea mining. Something is evidently: no matter we discover, I’ll try to feed my childlike sense of enthusiasm and you should definitely ask “Why?”

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