The Japanese Officer Who Watched His Harbors Die Without a Single Ship Ever Attacking Them

In the summer of 1945, ships were dying inside Japan's own harbors and no one could see what was killing them. No torpedo wake. No raider on the horizon. No bomber overhead when a freighter cleared the breakwater, turned into a channel that had carried traffic for fifty years, and came apart from underneath while the men on the docks watched. The man responsible for stopping it understood the weapon better than anyone alive in Japan, and could not stop it at all. His name was Captain Kyuzo Tamura, Chief of the Mine Section of the Imperial Japanese Navy's Technical Department. He was a physicist by training, twenty-five years in a navy that no longer existed when he sat down across a table in Tokyo in the autumn of 1945 and answered an American officer's questions about how his country had been strangled. Three hundred and forty-nine ships and twenty thousand men had spent the last months of the war trying to keep the harbors open. Three out of every four of those minesweepers were gone. This is the story of Operation Starvation, the aerial mining campaign almost nobody remembers, and the weapon that closed the harbors of an island nation without a single ship ever entering to attack them. B-29 Superfortresses of the 313th Bombardment Wing flew up from Tinian one aircraft at a time and dropped sea mines by parachute into the water Japan depended on for everything. The mines did not explode on contact. They settled on the bottom and waited. Some woke to a ship's magnetic field, some to the beat of propellers, some to the pressure a moving hull pushes ahead of itself. Many carried counters set between one and nine, so a channel could be swept clean, proven safe by ships passing over it, and still hold a mine in the mud that was counting hulls, waiting for its number. The ship that died was often not the first to take the risk. It was the one whose captain had watched the others go through ahead of him. In the last six months of the war, that one weapon put more enemy tonnage on the bottom than every other American cause combined. It demanded under six percent of the bomber effort. It cost sixteen aircraft. Traffic through the Shimonoseki Strait fell to a tenth of what it had been. Kobe collapsed by eighty-five percent. Thirty-five of forty-seven essential convoy routes were abandoned. Japan's own industrialists warned that another year of war meant seven million dead of starvation. And when the Americans asked Tamura whether they had run the campaign correctly, the chief of Japan's mine section did not flinch. The B-29 mining, he said, was so effective against the shipping that it starved the country, and the United States could probably have shortened the war by starting earlier. He called it a far-sighted policy. It was the judgment of the one man best equipped to deny it. This video covers the full story: the science of the mines, the ship-counter mechanism that made swept channels lethal, the harbors that closed one by one, the battleship Yamato forced out the one door the carriers were watching, and the young American interrogator who took the notes and, twenty-seven years later, ordered the mining of Haiphong Harbor himself. If you want more history like this, the kind that doesn't get told, consider subscribing. New videos every week.