
5 X* M- Z: P& V7 a1 ?$ D( {- e; JOne of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico. 5.39.217.760 e7 D- F2 t+ `4 W/ @3 _0 l- G
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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.
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Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.公仔箱論壇/ i r4 u: o9 |9 {
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$ \8 E7 y) K* |- g5.39.217.76Deep 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 centigradetvb now,tvbnow,bttvb& F& z- ]2 r8 }
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, l9 x6 _+ |' R' UIn another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |