On a sailing boat anchored off Oman's pristine Daymaniyat Islands, volunteer divers pull on wetsuits, check their scuba tanks and then take turns plunging into the clear turquoise water. They are diving for a reason: to remove the massive fishing nets damaging an unusually resilient coral reef system that is seen as more likely than most to survive rising sea temperatures. The clean-up is one example of how divers and Omani authorities are joining forces to protect the reefs -- which are critical for marine wildlife -- from man-made damage.