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One of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico.
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4 r1 g2 }2 X! M% dDivers 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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% o f& _+ Q! F5 W6 vtvb now,tvbnow,bttvbDivers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.
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0 O0 @( s, U+ o7 S$ B, tDeep 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. `9 z4 U/ C4 F+ A- S! [. }
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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. |