Pick of the day.
On Thin Ice (9.00pm) James Cracknell and Ed Coats are forced to train without Ben Fogle while he recovers from a flesh-eating disease. After doctors give Ben the all-clear, the trio make the final preparations for the race and head to Antarctica for a 10-day acclimatisation trek.
The Secret Caribbean with Trevor McDonald (8.00pm) The journalist visits islands that have been shaped by natural events, beginning with Montserrat, which was devastated by a volcanic eruption.
Revelations: Commando Chaplains (7.00pm) Documentary following the work of Royal Marine chaplains Nigel Beardsley and William Gates, who risk their lives to bring faith to the front line in Afghanistan.
Among the Apes (8.00pm) Charlotte Uhlenbroek encounters rare mountain gorillas in the forests of Uganda, one of the few places where they can be found in their natural environment. Last in the series.