Entry 037 - They called it Cannikin.

Cannikin went off on November 6, 1971, beneath Amchitka Island, Alaska.

The official story called it a 'seismic calibration test.' They wanted to see how underground detonations registered on Soviet monitoring equipment.

That explanation falls apart pretty quick.

Cannikin was massive. Five megatons. The largest underground nuclear explosion the United States ever set off. And they buried it beneath an island already full of fault lines.

Scientists warned the island could fracture, while others said it might trigger a bigger seismic event. Some even raised the possibility of a tsunami.

They decided to go ahead anyway, quietly.

My grandfather's files list Cannikin as a terminal containment attempt.

Amchitka shows up over and over as a 'persistent site.' They'd mapped it and measured it and known about it for years.

The five-megaton yield was chosen because smaller ones had already failed to produce meaningful compression at depth.

One note says:

If this does not collapse it, I don't think anything will.

Seismic records show the island lifted several feet during detonation. Then it settled back down. That's what gets cited as proof of success.

What gets left out is the secondary motion that quickly followed. Irregular, delayed aftershocks.

Instrument logs show a brief loss of continuity across multiple channels. The readings were absent.

Cannikin ended underground testing at Amchitka.

Afterward, they sealed the site. Classified and abandoned it. The fences went up, and so did the monitoring stations, signs warning about digging.

If Cannikin was really about measurement, they would have come back. But they left instead.

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