So could it be behind this dead zone? ''The largest such dead zone in the world is in the Gulf of Oman, a strait bordered by Iran, Pakistan, Oman, and the UAE. It occupies a whopping 165,000 square kilometres of the water body, an area bigger than even the state of Tamil Nadu (130,060 square kilometres). https://nyuad.nyu.edu/en/news/latest-news/science-and-techno...