A tourism business operator in Samoa says food from a container on the sunken Manawanui has been polluting the water, attracting sharks to popular surf breaks. The New Zealand navy vessel sank off the southern coast of Upolu a week ago and has sparked widespread concern for the environmental impact. Brent Ross owns the tour company Offshore Adventures, which takes people fishing, snorkelling and surfing, but says it's currently not safe to operate and his busines is on hold.