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Diving expedition in underground river in Son Doong Cave
https://www.youtube.com/watch?time_continue=55&v=UvtZx8OwEkc&feature=emb_title
The professional divers from British Cave Research Association supported by Oxalis Adventure have just come back from their diving expedition in the underground river...
Son Doong cave Vietnam (Discovery Son Doong cave)
https://www.youtube.com/watch?time_continue=17&v=78zfZe3IVgw&feature=emb_title
Discovery Son Doong cave Vietnam Son Doong cave(Vietnamese: Hang Son Doong) is world's largest cave, located in Quang Binh province, Vietnam. It is found...