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It was a short walk to the brown, heavy waters of the river.

This was the world's first plant for industrial mass production of heavy water.

Heavy water can be a key ingredient in a long series of steps to make nuclear weapons.

But Norwegian officials said at the time that they did not know where the heavy water ended up.

But Peenemünde as the center for research in heavy water was a much different matter.

He felt as if he were moving through heavy water.

Included in this operation were 26 drums of heavy water, the world's entire stock at the time.

Experiments showed that bacteria can live in 98% heavy water.

However it ran into heavy water and wrecked near the island.

The link between heavy water and a German nuclear energy project was established later.