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One of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico.
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' r) p6 Q4 R0 G$ L. x9 a' D0 pDivers 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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Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.公仔箱論壇% ~4 k2 M7 X3 v4 G1 u& X
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, m8 O& C$ ]4 }. X% g5.39.217.76Deep 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 centigrade
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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. |