
/ D& U+ p& D! y% bOne of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico. 公仔箱論壇5 \% ]) J& D; o% Q% U. @
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+ h, {, j& V3 \) {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.% c3 C. T. ?: O* G0 e6 q
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' T$ k* j% g- l7 P2 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.公仔箱論壇. ?3 F9 v; u: t& |, N1 {8 I
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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 centigrade! `; X1 P F: O. D! d0 i
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. C% m/ ]' f$ `. {1 p, g N/ `tvb 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. |