I tried to find the reef where the freighter Rena crashed about 10 miles off Tauranga/Newzeeland.
could be here: Feature Class: UWTROC
Position: 037 34.9403 S 176 21.5123 E
try to find this in cm93. it's quite hard to find !!!! and often invisible depending on your depht settings.
I don't know if this is really Rena's position but anyway it looks dangerous and is not really visible as underwater rock.
comparable fault I found already in 2009 and stated here,
Feature Class: WRECKS
Position: 057 21.4153 N 017 09.1334 E