Seoul proposes extending its Cheonghae unit’s patrols to waters near Oman’s Duqm amid US pressure over Iran war. South Korea plans to expand the operations of its anti-piracy Cheonghae unit to waters closer to the Strait of Hormuz, the Defence Ministry said, following pressure from. SEOUL, Nov 5 (Reuters) - South Korea plans to expand the operations of its anti-piracy Cheonghae unit to waters closer to the Strait of Hormuz, the Defence.