5.39.217.776 q# A! y' B c9 ~/ V) }
One of Martyn's diving companions, Robbie Schmittner, in a huge flooded cave in Mexico.
: S) H; g5 z" w/ Q, F6 \tvb now,tvbnow,bttvbtvb now,tvbnow,bttvb) V9 _& N8 D: ^' i: {9 E
公仔箱論壇/ w% M( @8 q6 \
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.
" E& J ]; q3 _& otvb now,tvbnow,bttvb+ v" {1 S7 ~9 X! N+ ]: m, G/ w

8 i7 ]+ K9 ~1 k) T5.39.217.77Divers often use guide-lines to keep them on track in the murky depths. Getting lost can be fatal.
! y. \. H0 e& }0 S) |9 W3 M( V' H0 H
0 ~1 Y+ p3 [& T4 P0 `5.39.217.77 ) g2 Q: a$ v; d7 x; M7 u
Deep 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公仔箱論壇" Q4 W+ o! U5 j+ C! d2 ?3 X4 H
9 O$ ~, E: P# Q S( ` K" n5.39.217.77 $ T$ F# k2 k! t( H, H# s/ J9 ?
In another of Martyn's photos Helen Rider swims through the narrow confines of Taina Cave near Santo Domingo in the Dominican Republic. |