Yellow sub finds clues to Antarctic glacier's thaw

Data helps to explain quicker sea-level rise

ATHENS - A yellow submarine has helped solve a puzzle about one of Antarctica's fastest-melting glaciers, adding to concerns about how climate change may push up world sea levels, scientists said on Sunday.

The robot submarine, deployed under the ice shelf floating on the sea at the end of the Pine Island Glacier, found that the ice was no longer resting on a subsea ridge that had slowed the glacier's slide until the early 1970s.