Sky History 2 HD Wednesday

Expert investigations into the possibility that reptilian aliens are more than a pop-culture creation and a favourite of works of science-fiction

Part two of two. Documentary revisiting the alleged crash of an extra terrestrial craft at Roswell, New Mexico in 1947

A mysterious UFO over Chile. Plus, the deep-sea dive that plunged a research vessel into the heart of an underwater lake of death

Lacking in speed and might, the SS Andrea Doria more than made up for it in beauty, but on the night of 25 July 1956 - the Italian liner met a disastrous fate

Professor Alice Roberts explores the medieval history of Lincoln, visiting the cathedral that was once the world's tallest building

Investigations into whether ancient tales of beings with super-human powers could be inspired by extra- terrestrials who came to Earth in the past