>This is the biggest active, water-filled thermal water cave and hall in
>the world," speleologist Sandor Kalinovits, one of the lake's
>discoverers, said during a tour of the cave below one of Budapest's more
>affluent residential districts.
>
>The lake, discovered earlier this year, lies in a subterranean hall 86 m
>(282 ft) long, 27 (89 ft) m wide and 15 m (49 ft) high and belongs to
>the Janos Molnar cave.
>
>See full story at:
>
>http://www.iht.com/articles/reuters/2008/11/18/europe/OUKWD-UK-HUNGARY-CAVE.p
hp
But see Dublyansky, V. N., "A Giant Hydrothermal Cavity in the
Rhodope Mountains, Bulgaria" (_Speleogenesis: Evolution of Karst
Aquifers_, NSS, p. 317, abstract): "A giant cavern was intercepted by
drilling at the Madan tin-zinc ore deposit. The cavern is developed in
Archean and Proterozoic marble, has an estimated volume of 237.6 million
m3, has a maximum intersected vertical dimension of 1341 m, and is filled
with thermal water under high pressure." Although humans have not been
able to enter and explore this Bulgarian thermal cavern, its dimensions
appear to dwarf the size of the newly-reported Hungarian thermal lake.
--Donald
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