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One 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.
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6 K, V! z2 T K& {4 EDivers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.
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0 y& _4 y0 F3 @+ j$ R+ w& K7 F a1 hDeep 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: Z4 F8 Z8 O1 ?0 x# _* J
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) P, q: X# Q1 Rtvb now,tvbnow,bttvbIn another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |