
7 E2 ]0 s7 X0 d3 \! Ctvb now,tvbnow,bttvbOne 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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Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.
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' z/ @( y# W# |4 H公仔箱論壇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 centigrade' u% L* ]# T, q
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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. |