Sydney Harbour Cops 1-2

The MAC tackles rescues and unexpected discoveries across NSW waters before Nemesis heads to Newcastle as protesters take to the harbour in a bid to blockade the world's largest coal export port.

The Marine Area Command oversees an international fleet of warships on Sydney Harbour, while the Dive Unit heads to rural NSW to hunt for a missing gun in the turbulent waters of a surging river.

Police rescue a man on the Sydney Harbour Bridge. The Dive Unit searches a river for a live grenade, while a series of shark attacks puts Sydney's waterways on high alert.