Bollywood actress Sadia Khateeb recently completed a challenging four-day shoot inside Vietnam's Son Doong Cave, known as the ...

Son Doong, the world's largest cave in central Vietnam, ranks among the world's most surreal destinations, according to U.K. travel magazine Wanderlust.

In the cave, Nelson noted there were certain spaces where sunlight penetrates through — if only for 30 minutes a day when it’s not overcast. So exposing for the scene wasn’t as hard as expected.