High up in the Pennines of north-west Yorkshire a river leaps down a notable hole called Gaping Gill and disappears into the limestone hill. A couple of miles away at Ingleborough Cave a river appears out of the earth: today, it is known that these two rivers are one and the same.
For over a year, teams of fanatical potholers have attempted to make what is perhaps the last great geographical discovery in Britain: by what secret passages and chambers does the Fell Beck find its tortuous way from Gaping Gill to Ingleborough Cave? Perhaps even more extraordinary, an ex-BBC man Syd Perou, with a hand camera and a few lights packed in ammunition boxes, has for 15 months filmed the search in appalling conditions.
To have been a caver down some passages with only an inch of air space between water and rock is a considerable achievement. To have filmed it is an astonishing feat.

Turkey is a natural land bridge linking the East with the West.
Each year, across Western Turkey, come millions of birds on migration between Asia, Africa, and Europe. They cross high mountains and arid plains to reach Turkey's great lakes and reed-beds, vital to the migrants' survival.
Other animals have adopted man-made habitats, living amongst the crumbling palaces and temples of southern Turkey that stand as reminders of the great empires that once dominated this part of the world.