Night diving can get you up close with sleeping fish, and introduce you to fishes that patrol the reefs at night.
A remarkable wildlife event that occurs in winter in New Zealand... and most people don't even know about it!
Stalactites 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 dark
Away from the cavern zone, underwater caves exist in perpetual darkness, lit up for mere seconds as cave divers pass through.
A 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 divers
In the subterranean passages of Mexico's Yucatan Peninsula is an underwater world enjoyed by cave divers.
Calcite 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.