A number of people were unintentionally present at the dawn of the nuclear age, exposed to fallout from world’s first atomic bomb. They say the government did nothing to warn them about potential dangers before or after the sudden blast.

A listing of regional events in observance of the 70th anniversary of the Trinity test in New Mexico.

For the dwindling number of people still living who had a hand in making the atomic bomb, all the death, fright and global instability that their work unleashed has not, all these many years later, shaken their resolve that they did the right thing.

From the beginning of World War II in Europe to the dropping of the bombs at Hiroshima and Nagasaki,

A special project by the Wall Street Journal with searchable data outlining nuclear-waste sites around the United States.

About the Series

SUNDAY, July 12

Those who worked on the bomb felt it was better than allowing war to continue, and many still feel that way today. Read more.

MONDAY, July 13

After suffering for decades from Trinity’s aftermath, downwinders are only now beginning to be heard.

TUESDAY, July 14

The bomb that helped end World War II also left behind a legacy of contaminated waste that may never be completely cleaned up.

WEDNESDAY, July 15

Trinity forged a tragic link between New Mexico and Japan. Now Japan and the lab that built the bomb are working together.

THURSDAY, July 16

Long after the Cold War, the world is as dangerous as ever — another legacy of Trinity