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One of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico.
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& v% L1 J: i2 ^9 Z, 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.5.39.217.76: y0 M! B$ z8 W( }3 l
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Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.tvb now,tvbnow,bttvb5 }% B7 u+ E9 W! y, q! d, E
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_- o' r- V) e4 N) u3 k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 centigrade5 |) I$ y8 L) o5 w
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) d7 l( d# F; U( VIn another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |