Remembering the summer of stingrays
Every summer short-tailed stingrays gather at the Poor Knights Islands Marine Reserve off the Tutukaka Coast of northern New Zealand. Last summer, January 2018, was a one in 15 years event.
 StalactitesStalactites are icicle-like rock formations that hang from the ceilings of caves. They're one of the delicate formations that we need to dive most carefully around when cave diving.
 Bringing light to the darkAway from the cavern zone, underwater caves exist in perpetual darkness, lit up for mere seconds as cave divers pass through.
 Going undergroundA slab of rock that was once part of the ceiling lies like a giant altar on the road through Mexican cave system Sac Actun.
 The world explored by cave diversIn the subterranean passages of Mexico's Yucatan Peninsula is an underwater world enjoyed by cave divers.
 Calcite dunesCalcite forms at the water's surface where there is contact with air. Below the air domes in cenote Nohoch Nah Chich, vast dunes of calcite have built up from the calcite settling to the cave floor over thousands of years.
 String of PearlsHarry Gust started exploring String of Pearls in 2006. Exploration was interrupted when the landowner closed access to the cenote during land disputes. The cave is open for diving again, under arrangement.
 New GUE sidemount classThe diver training agency Global Underwater Explorers has a cave sidemount class for advanced cave divers (prerequisite GUE C2).
 Sac Actun on sidemountSidemount is a versatile diving configuration that can be used to travel through very small cave passages, where backmount configuration may not be passable.
 Sac ActunIn 2018 the Mexican underwater cave systems Sac Actun and Dos Ojos were connected. Dos Ojos was absorbed into the bigger system Sac Actun, making Sac Actun the world's longest underwater cave system.
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