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Thomas Prior

In the slanting polar light, the tall cliffs on the edge of the iceberg cast deep shadows.

As B-46 breaks free, the brittle ice sometimes cracks at right angles.

In the Pine Island ice shelf itself, another sinuous crack has started to form.

Another view of the main fissure between B-46 and the ice shelf.

The fissure that separates the B-46 iceberg from the shelf of the Pine Island Glacier in West Antarctica.

Large sections of B-46 float in front of the Pine Island ice shelf. Scientists worry that the entire ice shelf might one day disintegrate, unleashing the glacier behind it.

Curving ice canyons mark the edge of the new iceberg, dubbed B-46, as it breaks off the thick, floating ice shelf of the Pine Island Glacier in West Antarctica. In the foreground lies broken sea ice on the dark surface of the Amundsen Sea.