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.
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.
Springtime - the source of so much joy as the sun returns after winter - is a time of dread for many scuba divers in New Zealand. It brings with it phytoplankton blooms that provide salps with the food source they need for rapid reproduction. Colonial species can form chains twenty metres long.
Cenote La Concha is part of cave system Sac Actun in Mexico. It's a spectacular cave that has been scarred by deliberate vandalism by cave divers writing in the silt.
Decorated cave ceilings
Stalagtites form on the ceiling when the cave is dry and are some of the most delicate and magnificent features of an underwater cave. Cave divers must look up!
Cave diving from cenote to cenote
The Quintana Roo Speleological Survey reports that there are 187 cenotes in cave system Sac Actun in Mexico. Cave divers can hop from cenote to cenote via the cave.