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In essence, it was a big raft, with tall, reinforced sides on 60 empty steel drums for buoyancy, towed by motorboat.

Jagged grey peaks suddenly appear before us, as the motorboat navigates choppy coastal waters and dramatic fjords at Greenland's southern tip.

A local fisherman, Giuseppe, told Reuters he was on board a motorboat when he saw "mats and T-shirts floating in the sea".

"Importantly, this method doesn't rely on costly field techniques such as motorboat towed tests, which makes it suitable for large-scale studies across diverse habitats."

The May 19 airdrops at Second Thomas Shoal by the Philippine military sparked a race by the Chinese coast guard and Philippine navy personnel aboard small motorboats to retrieve the four packages.