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An Australian father is demanding answers as the search for his wife, who vanished in flash floods along the Nepal-Tibet border, nears its second week.

Newcastle father-of-two Bhavin Patel has tirelessly searched Nepal’s disaster zone for his missing wife, Reshma.

He has chartered a helicopter, tracked his wife’s phone signal and pleaded with governments of three countries for help, and is yet to find any trace.

“She is my life,” the father-of-two told AAP.