A mystical underwater phenomenon not observed since 2001 is happening right now in New Zealand. Large numbers of female short-tailed stingrays have stacked in Northern Arch at the Poor Knights Islands.
90 Metre Room in Tank Cave
Australia's Tank Cave has tan-stained walls, which is what makes this room so outstanding. The collapsed slabs of rock have revealed the internal white of the limestone. The cave's tunnels spider out in multiple directions from this room.
Banded coral shrimp
You usually see the antenna before the shrimp - wispy filaments peeking out of a crack. Banded coral shrimp are generally found in pairs, often with a moray eel close by.
Sharks are known for their impressive teeth... but in the fish world it's the moray eels with their gaping jaws of inward-slanted fangs that you should be wary of.
Everyone wants to know if you see sharks when scuba diving. If you're very lucky you may get close enough to see the texture of their skin!
Tank Cave in Australia
It's called the Limestone Coast - a strip of coastline in the south east of South Australia. Do you know what limestone means? Caves!
Inside the Canterbury wreck
She's filling up with silt and Bigeyes. They're nocturnal fish that use the bowels of the Canterbury for shelter during the day and venture out to feed at night.
Canterbury Wreck 2007-2017
Celebrating 10 years since the sinking of the Canterbury in Deep Water Cove on 3rd November 2007.
Ten years have passed since the ex-Navy frigate of the HMNZS Canterbury was scuttled in Deep Water Cove in the Bay of Islands.