| 11. | Ninnis fell through a crevasse, and his body weight is likely to have breached the snow bridge covering it.
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| 12. | Climbers normally go around it or cross one of the snow bridges that naturally form across the gap, he said.
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| 13. | Wisting later recalled how his sledge, with Amundsen aboard, nearly disappeared down a crevasse when the snow bridge broke underneath it.
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| 14. | Snow bridges are fastened to the slope on the upslope side by tension anchors and on the downslope by compression anchors.
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| 15. | Cook's east face, when he fell eight meters ( 26-foot ) into a crevasse when a snow bridge collapsed on Wednesday.
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| 16. | A crevasse may be covered, but not necessarily filled, by a snow bridge made of the previous years'accumulation and snow drifts.
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| 17. | Climbers normally go around it or cross it on one of the snow bridges that naturally form across the gap, he said.
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| 18. | At the base of the descent, a 1 2-metre-wide crevasse runs end to end, and there are a couple of snow bridges.
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| 19. | Occasionally a snow bridge over an old crevasse may begin to sag, providing some landscape relief, but this cannot be relied upon.
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| 20. | Climbers normally go around it or cross it on one of the snow bridges that naturally form across a gap, he said.
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