BarbarianH11
Refer Wiki Voyage for more info about Minerva Reefs.  Note both submerged at high tide, and North Minerva reef used more by cruising yachts due to better access through entrance channel.  Only known man-made feature on either reef is an old metal light station, probably not working now.  North Minerva used by cruising yachts during summer mainly as stop-off and snorkel etc spot between NZ and Tonga.