Tel Aviv, Sept. 29 -- Israel's Channel 12 has broadcast the latest episode of its adventure series "Danny Kushmaro: Till the Edge", highlighting Vietnam's Son Doong Cave - the world's largest natural cave - as a destination that tests human endurance, spirit and resilience under extreme conditions. Veteran Israeli journalist Danny Kushmaro and his team navigated the cave's muddy paths, jagged rocks, and wet, slippery crevices, where every step carried risk. At one point, Kushmaro slipped in complete darkness, with all communication signals cut off. The suffocating atmosphere, low oxygen levels, and creeping cold made the expedition tense and breath-taking. Located deep within Phong Nha - Ke Bang National Park - recognised twice by UNESCO ...