What on Earth?
Season 4 Episode 4
An extraordinary lake in Canada that may hold the key to whether life exists on Mars. Plus, a Second World War aerial photo possibly containing a coded message left by a vicious Elizabethan religious fanatic and a bizarre six-mile-long scar that appeared in the Australian Outback overnight
What on Earth? airs on Sky History 2 HD at 2:00 PM, Sunday 30 March.
Topics
News ➝ Current Affairs
Documentary