During the writing of this book, I requested the major proponents of two leading theories on the Tunguska event, Dr Zdenek Sekanina of NASA's Jet Propulsion Laboratory in California and Dr Vitalii Bronshten of the Committee of Meteorites of the Russian Academy of Sciences, to express their latest views on their theories. I was saddened to hear of Dr Bronshten's death a few weeks after I had written to him. I'm grateful to Dr Sekanina for his response.

I'm also grateful to Dr Robert Foot of the University of Melbourne; Professor Wolfgang Kundt of the University of Bonn; and Dr Kiril Chukanov of Chukanov Quantum Energy in Salt Lake City, Utah, for commenting on their research on the Tunguska event.

My special thanks go to Dr Marek Zbik of the Ian Wark Research Institute at the University of South Australia for his help in providing research papers and illustrations; to Mr Vitalii Romeiko of Moscow for giving permission to use his photograph of the Suslov crater; to the staff of the State Library of Victoria for their courteous help on numerous occasions; to Geoff

Coleman, Simon Kwok, Ruth Learner, Darren Lewin-Hill and Arun Tomar for their moral support; and to Eric ('Fizzle') Fiesley and Colin ('Stick') Storer for being true Aussie mates for more than 30 years.

The writing of this book became a pleasure with Dr Andrei Ol'khovatov's enthusiastic support in many ways. Dr Ol'khovatov, formerly of the Soviet Radio Instrument Industry Research Institute and now an independent researcher in Moscow, is a well-known personality in the Tunguska cyberspace and research communities. Thank you, Andrei. Keep the Tunguska fireball burning brightly.

I'm indebted to Icon Books' publisher Simon Flynn for giving me the opportunity to write this book, and their editor Duncan Heath for his indispensable advice.

Finally, I would like to thank my wife Suman and my sons Rohit and Anuraag for their unfailing support throughout the writing of this book.

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