In 1959 nine people died in a mysterious mountaineering incident in Soviet Russia that continues to confound and intrigue onlookers.

A recent Russian investigation determined that an avalanche probably led to the mountaineers' deaths, but some are still not convinced.

Among the doubters is Teodora Hadjiyska, a long standing Dyatlov Pass researcher, whose new book Height 1079 details her theory of the events of February 1959.