Underwater stalactites
Stalactites are formed by the precipitation of minerals from water dripping through the cave ceiling. The presence of stalactites tells us that this cave was once dry.
 Sac Actun Mexican cave system Sac Actun is currently listed as the world's second longest underwater cave with 248 kilometres (154 miles) of mapped passage.
 Cenote Taj Mahal Late in the day rays of sunlight stream towards one of the cave entrances in system Taj Mahal in Mexico.
 JellyfishI encountered this tiny jellyfish, about the size of a fingernail, enthusiastically jetting about in the surface three metres of water at the Poor Knights Islands.
 Blue maomao Schools of Blue maomao are one of the many wonders of the Poor Knights Islands Marine Reserve in New Zealand.
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Underwater
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