The Sea Cadets in Christchurch were founded by a senior military officer, Colonel Vere Staunton Smyth, formerly of the Royal Warwickshire Regiment. Smyth had arrived in New Zealand some time before 1907 and served during World War I in the New Zealand Rifle Brigade.
Here is how the new organisation was reported in The Press on 1 October 1929
Smyth was concerned that the article placed emphasis on cadets going on to join the Navy or the Volunteer Reserves, and did not want this expectation to limit recruiting, so he penned a letter to the editor which was published three days later.
Cadet enrolment began at the Navy League Hall in Christchurch later that month. Here is a Press report from 17 October.
These clippings from The Press were sourced through https://paperspast.natlib.govt.nz/.