HMNZS Manuka

Background
The vessel was ordered after the New Zealand government, facing a requirement for more minesweepers to operate in home waters, chose the Castle-class trawler design because it was simple enough to be built with the country's limited ship construction facilities at the time.

Construction
Manuka was laid down on 21 October 1940 and was of a composite design, using Kauri wood due to a shortage of steel at the time. Manuka was launched on 23 September 1941, being built by Mason Bros Engineering Co, located at Auckland. Being the third naval ship launched in New Zealand for the Royal New Zealand Navy.

Operational history
Manuka was the third of four composite minesweepers constructed for the Royal New Zealand Navy and was commissioned on 30 March 1942. The others were HMNZS Hinau (T17), HMNZS Rimu, and Tawhai. Manuka served in the LL Group (later renamed to the 194th Auxiliary Minesweeping Division) which was located at Auckland.

Post-war
In 1946, Manuka was leased to the Chatham Island Fishing Company, under the condition that she would only be used in New Zealand waters, and that she would be given back to the navy in case of an emergency. Manuka would follow fishing fleets, working the coast that was sheltered. At the end of the day the fishing trawlers would discharge their catches onto Manuka, where they would weigh, clean and process the fish. When she was full, she would sail to Wellington, often carrying radios for repair, and mail. When the vessel returned it would carry supplies for the Chatham islanders. As time went by while in service, there would be more and more problems with the boiler on Manuka. to the point where she would need a replacement. Over the course of her career she would also run aground multiple times while fishing. In 1950, Manuka was moored in Port Hutt, acting as a floating freezer, with local trawlers storing their catches onboard. On 4 October 1952, while anchored in Port Hutt, Manuka sunk at her moorings. There was nobody aboard when she sank.