
8 t2 W: u( u# I- z" FOne 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.4 k* S9 W/ n/ D6 m% O% R
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Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.- q! f/ q r b. W6 Q5 I
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3 }$ I+ z J! U8 Y9 B1 I* D* J6 s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 centigrade
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/ z# r1 o2 Q# G0 `1 |, @: f2 i2 KIn another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |