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One of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico. 5.39.217.76) J" u3 e* x! O9 ?* s
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) S1 ^" Y+ Z; Z, z' V8 t/ IDivers 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.5.39.217.76! Z* r6 `7 L: e
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Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.5.39.217.76/ d; U" t% t+ R7 m/ w0 K# E
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% \8 q @/ R3 c8 \3 j2 _7 X, vDeep 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# {( U0 Y; X( }
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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. |