From Conquering The Pacific: An Unknown Mariner and the Final Great Voyage of the Age of Discovery, by Andrés Reséndez (HarperCollins, 2021), Kindle pp. 189-192:
Not everything, however, was against the San Lucas expeditionaries. By paralleling the coast of Japan, they were riding the most powerful current in the Pacific Ocean. The Japanese call it Kuroshio, or “Black Current,” owing to its characteristic cobalt-blue color. An integral part of the North Pacific Gyre, the Kuroshio Current is an enormous ribbon of warm water that starts in the Philippine Sea, brushes against the coast of Taiwan, and moves rapidly up the eastern side of Japan, snaking and pushing against the cold waters coming from the Bering Sea. After veering off from Japan, the current continues eastward for about a thousand miles as a free jet stream known as the Kuroshio Extension, eventually feeding into the larger North Pacific Gyre. This explains why historically some Japanese ships disabled in storms have washed up in North America. This may have occurred prior to 1492, although no hard evidence has surfaced. More convincingly, scholars have estimated that between the sixteenth century and the middle of the nineteenth, more than a thousand Japanese vessels were swept out to sea. Among them, a handful are known to have made landfall in the Americas. A rice cargo ship called the Tokujômaru, for instance, ran into a storm that broke its rudder, causing it to drift for sixteen months until running aground in 1813 near Santa Barbara, California, with only the captain and two crew members still alive. Nearly twenty years later, a similar incident occurred when a merchant ship bound for Tokyo, the Hojunmaru, was knocked off course by a typhoon, only to reappear after fifteen months, rudderless and dismasted, in Cape Flattery, the most northwesterly point in the continental United States.
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The San Lucas voyagers reported an unexpected abundance of life in that part of the ocean, an observation that confirms their whereabouts. The collision of the warm Kuroshio Current with subarctic water produces eddies of plankton that are visible even in satellite images. In turn, the plankton attract a variety of animals. The Spanish expeditionaries saw “pig fish as large as cows” and marveled at the “dogs of the sea with their paws and tails and ears . . . and one of them came aboard and barked at us” (almost certainly sea lions, with external ear flaps and very vocal, in contrast to true seals). Quite fittingly, the men of the San Lucas also crossed paths with the greatest migratory species of all. “Black shearwaters followed us, shrieking all day and night,” Don Alonso recalled, “and their cries were very unsettling because no sailor had ever heard them like that.” Sooty shearwaters pursue a breathtaking figure-eight migration spanning the entire Pacific. As they range from New Zealand to Alaska and from Chile to Japan, these noisy birds dive for food in some of the most productive regions of the Pacific, including the plankton-rich eddies off the coast of Japan, where some must have spotted the San Lucas slowly making its way in a northeasterly direction.
Climbing to forty degrees and up to forty-three degrees of northern latitude, the pioneers overshot the warm waters of the Kuroshio Current. They had journeyed farther north into the great ocean than any other Europeans, sailing through frigid waters coming from the Bering Sea. Only Magellan’s Trinidad had plied this part of the Pacific more than forty years earlier, where a storm had dismasted it and forced the last survivors to turn back. Extreme cold—that old nemesis of previous return attempts—became a serious concern for the crew members of the San Lucas, especially because they were missing most of their clothes after the washing party had to abandon them in Mindanao months earlier.
The San Lucas voyagers now faced “the greatest cold of winter,” as the captain put it, “even though it was the middle of summer in June and July.” For thirty days the sky turned so dark and stormy that they were unable to see the Sun or the stars. On June 11, snow fell on the deck and did not melt until noon. Lamp oil became so frozen that the bottle in which it was kept had to be warmed over a fire, “and it still came out in pieces like lard.” Modern historians have sometimes seized on such unlikely details to discount the veracity of Don Alonso’s account. “Porpoises as big as cows present no difficulty,” wrote one of these skeptics, “but it is unlikely that cooking oil would freeze in mid-summer.” Lamp oil freezes at around fifteen degrees Fahrenheit, and the process can start even at higher temperatures. Sailing by the Aleutian Islands in June, especially during the Little Ice Age, would force such doubters to amend their opinions.
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