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One of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico. 4 k8 s1 J. }6 Z1 F) l" p' h' [
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2 y; \+ m& Z8 ~" y+ jDivers 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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5 j5 @$ J& B5 b0 F# K9 `* s% `tvb now,tvbnow,bttvbDivers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.8 S, l* l7 n8 X5 N& j. \8 D4 \
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( J0 x- D+ s N9 J- f+ Btvb now,tvbnow,bttvbDeep 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. |