New Zealand has denied mass strandings of whales and dolphins in its waters are due to high-intensity sound, as claimed by an international environment coalition. In New York recently the Ocean Noise Coalition urged the United Nations to take steps to protect marine life from the powerful sound waves used in oil and gas exploration and by the worlds navies. Scientists believe there is a link between high-intensity sound and recent mass strandings of whales and dolphins in waters off Greece, Hawaii, New Zealand and elsewhere around the world since 1985. DoC spokesman Mike Donoghue said there was no evidence of such strandings in New Zealand. But Massey University marine mammal pathologist Padraig Duignan said strandings due to sonar noise had never been investigated in New Zealand.