
+ T3 Y5 y, Z8 J) hOne of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico.
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Divers carry remote underwater flash guns to illuminate this image, taken in what is probably the world's biggest underwater tunnel, Weebubbie Cave beneath the remote Nullarbor Plain of western Australia.
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/ @! \+ b n0 E! R. BDivers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal., L6 q7 A$ t0 ~# b
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Deep and dark doesn't always mean cold: Jenny Pinder swims through the underwater passages of the Grotta Giusti Cave in Tuscany, Italy. where geothermal activity heats the water to an amazing 35 degrees centigrade5.39.217.76, s+ M7 R) a+ g7 O# o+ S) f
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In another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |