The Boiler
It's the manta rays that make The Boiler, San Benedicto, Mexico, one of the world's most famous dive sites.
 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.
 Eden - the River RunCooler fresh water sits on top of warmer salt water, that intrudes into Mexico's caves from the sea. The halocline is what we call this meeting between the two bodies of water.
 Inside the Canterbury wreckShe'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 wreckTen years have passed since the ex-Navy frigate of the HMNZS Canterbury was scuttled in Deep Water Cove in the Bay of Islands.
 Diving for scienceTeams of cave divers coordinate efforts to collect samples for scientific researchers.
 Black coral 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.
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