'It's like layer upon layer of miracles': Rescue adviser tells BBC how survivors were reached

Tessa WongAsia Digital Reporter, in Singapore I've just spoken to Arnold Dix, the president of the International Tunnelling and Underground Space Association, who has been advising the Nepalese government on how to conduct the rescue. "I've never known a rescue operation where you had to look for an entrance of a tunnel that was previously up the hill, that was now underground," he tells me. "You can imagine the enormity of the avalanche, it completely buried the entrance." U