Ice chasm threatens Antarctica research station

The British Antarctic Survey research station Halley is under threat. Halley sits on an ice shelf that is constantly moving, leading to a chasm forming which threatens to send Halley floating off on a tabular iceberg into the southern ocean.

BBC Weather's Peter Gibbs reports from Antarctica.

See more on Horizon which was broadcast on Wednesday 4th May at 8pm on BBC Two. Click here to watch the programme on the BBC iPlayer.

Programme only available in UK.