Video: First hot air balloon under ground
A 70-year-old adventurer flies a hot air balloon in and out ot a 200-metre deep cave in Croatia
Wednesday 01 October 2014 18:55 BST
Comments
Subscribe to Independent Premium to bookmark this article
Want to bookmark your favourite articles and stories to read or reference later? Start your Independent Premium subscription today.
Already subscribed? Log in
Join our commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies