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One of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico. TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。# n( k; ?* B9 g; ]# _1 C) V
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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.* V9 r( r: r! i5 }+ e& w% P( \& z
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Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.5.39.217.77:8898! r) ~3 d. k$ _9 ^) t4 M6 h, ] ]
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! \. J, d1 M9 u' f B5 e5.39.217.77:8898Deep 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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( {4 U/ ^ G! z7 k8 @ I5.39.217.77:8898In another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |