Ice javelins
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Science 'javelins' spear Antarctic

UK scientists have developed an air-dropped projectile to put instruments in some of the most inaccessible places in Antarctica.

Twenty-five of these "javelins" are currently sticking in Pine Island Glacier, one of the continent's biggest and fastest-moving ice streams, monitoring its movement.

Dr Hilmar Gudmundsson from the British Antarctic Survey explains the thinking behind the javelin concept to our science correspondent Jonathan Amos.

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