�In pictures:�Southern rovers
Plane sailing

From the air, tracks made by the exploring robot are clearly visible.

Not all tracks led where the team intended. On one test, recalls James Lever: "It missed its last turning and headed south - towards the southern tip of Greenland, if we didn�t get it back. So we went out on a snowmobile and chased it down."

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Box on wheels'); CellColorMouseOver(this);">1Pulling power'); CellColorMouseOver(this);">2Under the hood'); CellColorMouseOver(this);">3Summit reached'); CellColorMouseOver(this);">4Plane sailing'); CellColorMouseOver(this);">5Step up'); CellColorMouseOver(this);">6Straight path'); CellColorMouseOver(this);">7
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