An unorthodox adventurer of winding formations and incredible passeges of underground sites sometimes never seen by man and an expert navigator john Spies Is an Australian photographer hold a tag of experience of more than 30 years of guiding cave explorer under his belt. This adventurer has journeyed into the depths of over 80 caverns in Laos , Thailand, and Vietnam –including a few caves previously undiscovered by humans. His remarkable explorations have included trips to tham Xe Bang Fai - cave in laos containing the world’s largest gour pool – and Vietnam’s Hang Son Doong, the largest known cave in the world.