Bravo Crater at Bikini Atoll, site of the 1954 hydrogen explosion where the island of Nam was destroyed.  Credit: Alamy

Bravo Crater at Bikini Atoll, site of the 1954 hydrogen explosion where the island of Nam was destroyed.
Credit: Alamy

RUNIT ISLAND — Black seabirds circle high above the giant concrete dome that rises from a tangle of green vines just a few paces from the lapping waves of the Pacific. Half buried in the sand, the vast structure looks like a downed UFO.

At the summit, figures carved into the weathered concrete state only the year of construction: 1979. Officially, this vast structure is known as the Runit Dome. Locals call it The Tomb.

Below the 18-inch concrete cap rests the United States’ cold war legacy to this remote corner of the Pacific Ocean: 111,000 cubic yards of radioactive debris left behind after 12 years of nuclear tests.

Brackish water pools around the edge of the dome, where sections of concrete have started to crack away. Underground, radioactive waste has already started to leach out of the […]

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