According to the web page found at http://homepages.vodafone.co.nz/~peterballantyne/awarua.html, the tug TSS Awarua was scuttled as a dive wreck and artificial reef near Breaksea Island & Ruapuke Island in Foveaux Strait, southern New Zealand on 19th December 1989. She was thus New Zealand’s second purposely-sunk dive wreck, with the Rainbow Warrior being the first one.
