
) g1 x9 P" j+ V) q9 [2 r7 {5.39.217.77One 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.5.39.217.772 e# D7 K# S6 q! W/ k% ?4 z
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Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.5.39.217.773 m* i; |% p! `$ }6 g5 S
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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公仔箱論壇5 V9 j5 X# t; T4 K
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9 i: S* B7 L" r( N' p/ [In another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |