The living, breathing ocean may be slowly starting to suffocate. More than two percent of the ocean’s oxygen content has been depleted during the last half century, according to reports, and marine ‘dead zones’ continue to expand throughout the global ocean. This deoxygenation, triggered mainly by more fertilizers and wastewater flowing into the ocean, pose a serious threat to marine life and ecosystems.

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Researchers have captured unprecedented data about some of the coldest abyssal ocean waters on earth – known as Antarctic Bottom Water (AABW) – during first voyage of the yellow robotic submersible known as Boaty McBoatface, which arrived back in the UK last week. The team captured data on temperature, speed of water flow and underwater turbulence rates of the Orkney Passage, a region of the Southern Ocean which is around 4,000m deep and roughly 500 miles from the Antarctic Peninsula.

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