nodule

Many of the minerals involved in proposed deep sea mining operations are located on black, potato-shaped nodules that lie on the seafloor.

Biden said his diagnosis was made on Friday after he reported urinary symptoms which led doctors to find a small nodule on his prostate.

The 82-year-old Biden went in for an evaluation earlier this week, which led doctors to find a "small nodule" on his prostate.

The deep sea contains billions of tonnes of potato-shaped rocks, called polymetallic nodules, which are rich in critical minerals like cobalt and rare earths.

As companies eye the best patches of ocean to search for the precious sulphides and nodules, dubbed “truffles of the ocean,” the waters near the Saya de Malha Bank have emerged as an attractive target.