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The islands are a dependency of New Zealand and lie at the western edge of the Kermadec Trench.

So far, the same group has discovered the Mariana snailfish and the ethereal snailfish in the Mariana Trench in the western Pacific Ocean, and there is a specialized snailfish species in Kermadec Trench in the South Pacific as well.

The researchers also found severe contamination in amphipods collected in the Kermadec trench, which is 7,000km from the Mariana trench.

During two expeditions in 2014, an international team collected wildlife from the Mariana Trench in the North Pacific and the Kermadec Trench in the South Pacific.

While the Key government has edged some economic policy rightwards, including a highly controversial partial sale of state-owned enterprises in 2012-13, it has also taken some steps more associated with left-of-centre parties - for example in social housing, in increasing welfare benefits, in setting a 2050 target to rid the country of rodents to preserve native wildlife and in declaring the Kermadec Trench a marine sanctuary.