Fossils in Ponderosa
The limestone in cave system Ponderosa is richly embedded with fossilised shells. This amazing cave feature can actually make diving the system quite treacherous. The fossil-rich rock is fragile and exhaled gas can bring large amounts of silt, pebbles, fossils and even large rocks down on your head as you're diving. Very fine limestone can turn the water milky and lower visibility to nothing.
Mexican cave system K'oox Baal
Travelling through an underground and underwater labyrinth with a piece of string to guide you - it's the stuff of dreams for cave divers!
Ox Bel Ha
The Quintana Roo Speleological Society lists the length of the Mexican cave system Ox Bel Ha as 270,174 metres with 143 cenotes.
Schooling blue maomao
Blue maomao are one of the well-known prolific schooling fish in New Zealand. At the Poor Knights Islands they congregate in archways when they're not out feeding in the midwater or snapping up food at the surface.
Tie Dye Arch
Marine reserves are special places, none more so than New Zealand's Poor Knights Islands. This underwater wonderland is a scuba diving paradise.
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.
Being bombed by a school of circling kingfish is not an experience that a scuba diver can easily forget!
Canterbury Wreck - the Bridge
Deep Water Cove in the Bay of Islands is a no fishing zone. The cove is the final resting place of the wreck of the ex-HMNZS Canterbury.
Long Cave - Poor Knights Islands
The volcanic origins of the Poor Knights Islands have lead to the geological formations we enjoy today - scuba diving in sea caves, archways, by plunging walls and pins.
The rocky reef at 60 metres
The skeleton of an old black coral tree smothered in anemones - there's a lot of life worth investigating at 60 metres on the rocky reef in New Zealand.