Antarctica is set for a clash of the frozen titans this weekend, when a vast iceberg twice the size of Greater London is expected to collide with a 44-mile long floating glacier.
The B15A iceberg, a remnant of the largest berg ever recorded, is moving at a mile a day towards the Drygalski Ice Tongue in the Ross Sea. It is on course to hit as early as today.
Scientists are struggling to predict the consequences of the impact of the 1,200 square mile (3,000sq km) slab of ice against the protruding glacier. The berg, which contains enough water to supply Britain for 60 years, could stick to the glacier, create a huge ice dam and cut off thousands of penguins from their feeding grounds.
If B15A picks up sufficient speed, however, the collision could snap off the Drygalski Ice Tongue from the mainland glacier from which it protrudes. Such a collapse could help the region