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One of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico.
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~( K# I% b' G- g- c4 ODivers 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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/ q/ |7 i3 a" |* P- f2 m公仔箱論壇Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.* J" Y7 P+ r# y4 G! ^% k
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0 E, u6 K' j8 k/ X7 v# D& jDeep 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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1 r2 q7 r3 P- |* N; s* Ptvb now,tvbnow,bttvbIn another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |