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One of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico. ; G1 U- M% p3 i
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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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! E( |% r2 a+ N8 n. }5.39.217.76Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.
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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 centigradetvb now,tvbnow,bttvb. o* W8 E$ i. [3 W$ L
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+ u- ^- i6 }$ U5.39.217.76In another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |