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One of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico. 3 y7 d9 f; e% N C: Z
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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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8 f1 x+ W! I0 e( A( D1 x8 L公仔箱論壇Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.tvb now,tvbnow,bttvb% j* S" R+ s. z+ {4 i& l
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; P, ^$ A% [ R) I# S- aDeep 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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In another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |