The 675 foot deep Mamet Cave in the Velebit Mountain in Croatianwas the scene of an incredible adventure, a successful first ever underground balloon flight. Ivan Trifonov, a seventy-year-old Austrian, has become the first man aliveContinue reading
The 675 foot deep Mamet Cave in the Velebit Mountain in Croatianwas the scene of an incredible adventure, a successful first ever underground balloon flight. Ivan Trifonov, a seventy-year-old Austrian, has become the first man aliveContinue reading