A vibrant world of black coral trees and sponges thrives on New Zealand's deep reefs as you descend beyond the level at which there is sufficient light for kelp to grow.
Diver propulsion vehicles (DPVs) and knotted line are useful tools for a cave diver who is mapping caves.
Feeding eagle ray
A silty haze in the entrance of Scary Cave at the Poor Knights Islands was being produced by this eagle ray as it hoovered around in the sand for food. A male sandager's wrasse was skulking nearby hoping to nab a tasty morsel.
Poor Knights Islands for Earth Day
This Earth Day I'm taking you underwater to show you the Earth I love. This is the Poor Knights Islands marine reserve, a sliver of protected New Zealand sea in a vast ocean.