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Crystal Cave of Svmnafellsjvkull in Skaftafell national park, Iceland
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Nature at its best: Created by the awesome forces of the Vatnajvkull ice cap in the south of the volcanic island, the deep blue cave was formed by the glacier meeting the coastlinewww3.tvboxnow.com5 C1 J( V* j. ?, k
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3 R; }. w5 T7 w4 i- E) J) Gtvb now,tvbnow,bttvbChanging size: Accessible through a 22-foot entrance on the shoreline, the cave tapers to a tight squeeze at the end no more than four feet high

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These ice caverns, hidden deep beneath the French Alps, are beautiful but deadly as the landscape changes quickly with the melting and freezing of ice.) [; {0 v, g# Y% i; [2 f
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1 R# a# h3 W; Y) `( L: {0 s6 {+ \, rDangerous terrain: The explorers stumbled across this ice cave on the north face of Mont Blanc du Tacul. However they had to abandon this opportunity due to the dangerous ice formations on the glacier abovetvb now,tvbnow,bttvb  @+ {3 i- Q* ]; S8 t2 R
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2 m, O4 [; y8 e, `www3.tvboxnow.comDeadly den: Ice caverns beneath the French Alps are a stunning but deadly backdrop as the landscape constantly changes as the ice melts and freezes

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Blue Hole, Bahamawww3.tvboxnow.com( A3 Q" e! \; j+ g

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The Mlynki is a rare crystal cave which lies in the Ternopil region of Ukraine and is known for the multi-coloured gypsum crystals which adorn its walls and twinkle in the light.tvb now,tvbnow,bttvb9 j4 P. a& K# |+ ^
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5 a- v( b1 Z2 D% btvb now,tvbnow,bttvbTwinkle: Two cavers look as if they are surrounded by  fairy lights as beams from their torch bounce off the crystal particles of the Mlynki caves in the Ukraine
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Cave of wonders: A couple sit and talk on a ledge as they take a break from climbing and appreciate the dazzling beauty of their  surroundings+ K. p) X$ y! E+ H3 c$ E
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All that glisters: A torch lights up the bowels of this impressive Mlynki cave giving off a red and yellow beams that bounce off the walls illuminating thousands of crystal particles which appear to glitter  against the backdrop of darkness
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Tunnel of light: This awesome shot captured by photogapher Oleg Grigoriev shows on a climber resting on a cave's ledge and taking in the beauty of his bewitching surroundingstvb now,tvbnow,bttvb# n2 O5 x7 M3 L
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Ascent: As this caver concentrates on making his way up  the wall of one of the caves the light from his headtorch catches lumps of crystal making them appear white% |5 w8 \  R, M) |+ O( L

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. D. r* H) `: P: kStar-gazing: Photographer Oleg Grigoriev ventured into the remote caves in the Ukraine to take these incredible shots. This amazing  image, taken from the cave's floor, doesn't look dissimilar to a starry night
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/ _  J( O% b+ ~$ Wtvb now,tvbnow,bttvbEnchanting: Strategically placed torches in the cave's  natural crevasses have a stunning effect on the walls, bringing out shades of  yellow, pink, purple and green

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Grand Canyon Cave Hotel
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The world's largest cave passage in the heart of the Vietnamese jungle
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Possibly the world's largest cave passage, Hang Son Doong was discovered in the heart of the Vietnamese jungle by a British caving team. At 150m long and 200m high, it is seven times as high as York Cathedraltvb now,tvbnow,bttvb; F; Y  Z, ?/ e+ k2 A' _! z

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! S& O# r1 Q& y  F: ]+ g  HOriginally discovered in 1991, the cave had not been entered since, due to the terrifying wind and noise from the large underground river
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' l2 O* ?4 f! i) K, ]/ c1 b4 OThe team spent five days exploring the cave after trekking six hours through the jungle to find it. They had to negotiate two underground rivers before reaching the main passagewww3.tvboxnow.com7 o& j. o7 i% `# U3 ^3 ?

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9 ?" d' M* Q, m. j7 ^9 Jtvb now,tvbnow,bttvbThe Hang Son Doong cave is believed to be almost twice the size of the current record holder. It has been hailed as 'amazing' and a 'significant discovery' by the expedition team

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John Spies explores the Tham Lod cave in Pang Mapha, Thailand. It is one of hundreds of caves located in this region and those visiting before sunset can watch the birds entering and the bats exiting in their millions
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As the light changes the water and rock formations in the Tham Lod cave take on different hues. There are thousands of fish in the cool underground water  C3 h3 x8 u+ c1 b  a1 l
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Rays of light flood a large natural entrance to this cave in the northern district of Pang Mapha in Thailand. A small figure peers out from the rocky dim worldTVBNOW 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。8 a* H7 R# \0 l( j: S: K/ g$ q

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* w# b4 v% x" @# O2 s Cave explorer David Pierce examines a 21.4metre high column which dwarfs over him at Tham Lod cave in Pang Mapha, ThailandTVBNOW 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。; [2 f! M# \% L
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, l9 j( r% K; A: Y/ Itvb now,tvbnow,bttvb John Spies in the midst of the rising white columns and falling stalactites at the Tham Lod in Pang Mapha, Thailand
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Shan Man Ong, standing on the bamboo raft explores the downstream entrance of Tham Lod cave in Pang Mapha, ThailandTVBNOW 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。# c- j: D3 P) H- c0 X

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3 S& _( ~) r. K7 Y. L, c) r3 Rwww3.tvboxnow.com Shan Man Ong, standing on a bamboo raft, explores the downstream entrance of Tham Lod cave in Pang Mapha, Thailand

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Vulcanites, the relatively rare formations of floating calcite rafts photographed in Tham Pha Mon cave in Pang Mapha, Thailand 9 O4 m$ L% e0 y5 W

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Dave Pierce examines the crisp lines of the flowstone at Tham Pha Mon cave in Pang Mapha, Thailand
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; U' R4 m7 d# N# U7 a+ a! {' b( w" qwww3.tvboxnow.com It may resemble a wasps nest but this is a rock formation called a cave pendulite hanging in Tham Pha Mon cave in Pang Mapha, Thailand

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, c, x, |( K' O, W5 U& Ktvb now,tvbnow,bttvb Cave adventurer Ian Robinson is silhouetted in the dim light as he examines the Tham Pha Puak , White Cliff Cave in Pang Mapha, ThailandTVBNOW 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。* A8 F  R: `8 b" V

9 _" S4 I+ P) N  C6 Q  U  gTVBNOW 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。 + q# q7 K" Q5 f) A* Y
Ian Robinson explores the Tham Pha Puak (White Cliff) Cave in Pang Mapha, Thailand

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Kerry Hamilton climbs a cave rope attached to bamboo scaffolding to scale the inner waterfall of Tham Susa in Pang Mapha, Thailand 公仔箱論壇. [4 R% \+ Z( p. {
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John Spies photographed at the entrance chamber of Tham Susa, a filming site for BBC's Planet Earth sequence in Pang Mapha, Thailandtvb now,tvbnow,bttvb. g' ~- b3 v) H4 `+ B  S

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/ J, ^: t, t2 m8 h# Y* [" b Oolites or cave pearls are sedimentary rocks formed from ooids, spherical grains composed of concentric layers. These were photographed in a cave in Pang Mapha, Thailand

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Suphaporn Singnakphum examines the decorated chamber in Tham Fossil cave in Pang Mapha, Thailandtvb now,tvbnow,bttvb0 q8 W7 b$ ]9 ~5 b/ x6 t6 g' y
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Intrepid adventurer David Pierce sits back in wonder to take in theTham Mae Lana, flowstone in the main stream passage in Pang Mapha, Thailand
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+ A0 _6 ]7 @" k* m' |' t/ L Beautiful blue and green-tinged stalactites hang in the dark recesses of natural caves in Pang Mapha, Thailand

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A majestic view of Tham Lum Khao Ngu (Snake Mountain cave) which houses the world's tallest cave column a monolith that stretches to a staggering 62metres. the downward falling stalactites take on a striking orange colour
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. |0 e( B3 f! d, `* `& Qwww3.tvboxnow.com Dave Pierce photographed at the entrance chamber of Tham Nam Lang in Pang Mapha, Thailand.

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Wye Cave at Maquoketa Caves State Park
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Visitors stare, amazed by the cave art in  Lascaux, south west France.0 t- ?1 D. d, x" t: G0 U

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7 F$ M& _3 X0 Btvb now,tvbnow,bttvbMesmorising: Art-lovers can't take their eyes off the  full-scale replications of the prehistoric work7 M% E- I3 Z2 x' B

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British explorers map out 'never-ending' cave network underneath　Borneo jungle
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1 Q6 Z# @4 |/ j& }+ Q# \tvb now,tvbnow,bttvbMaking a splash:  Expedition leader Tim Allen inspects the 'Shower Head' - a calcium-formed funnel  which transports rain water from the surface into caves underneath Gunung Mulu National Park, in Sarawak, Borneo' D6 X( c* Y4 \& j

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3 L. b( Z7 \2 S# H) wtvb now,tvbnow,bttvbLeaving a mark: Andy Eavis compares his hand size to ancient prints left in Black Hands Cave