Pearl Harbor: The USS Arizona Dissolves Slowly Into the Sea

Dec. 7, 2006 — -- After all these years, Franklin D. Roosevelt's voice still echoes.

"Yesterday, Dec. 7, 1941, a date which will live in infamy...."

Today, Pearl Harbor is very, very different. People remark at how peaceful it seems. That is fitting, because a thousand men are still entombed in the wreck of the USS Arizona.

"My concern is that the ship lives as long as it can as an artifact of history," says Daniel Martinez, a historian at the National Park Service.

But over time, that is becoming more and more difficult. Slowly, very slowly, the wreck of the Arizona is dissolving back into the sea.

Steel plates, once an inch thick, have rusted down to less than half that. Tiny marine creatures have planted themselves on the ship's hull and died there, creating a thick, concretelike coating that weighs it down.

And blobs of oil -- so smooth they look like black pebbles -- slowly float to the surface. There may still be half a million gallons onboard the Arizona; if the hull gives way, it will all escape.

When will that happen? It could begin in as little as a decade or two.

"As things corrode away, it's going to reach a point where it cannot support its own weight, or the weight of what's growing on it any longer, and it's going to collapse into a debris pile," says Timothy Foecke. He is a metallurgist at the National Institute of Standards and Technology in Gaithersburg, Md., and he's been watching the ship from afar.

He and his team have done a computer model of the Arizona's hull. It shows stresses building as the steel weakens and the concretion gets heavier.

In his laboratory safe Foecke has rusty samples from the ship. He brings them out to show us.

"You get a little jolt when you're holding a piece of the Arizona," he says. "You realize that it was the single largest loss of life in the history of the Navy.

"We can keep it together for several more decades, but eventually it's going to corrode away and become an iron-ore deposit, and that is just gravity and chemistry."