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Mail*Link(r) SMTP FWD>Re: Reply to Terho Hi Christopher, I am the member of Amphora Diver Club in Budapest (Hungary1027 Budapest II., Varsanyi u.33. Phone: +361-201-5482, FAX: +361-2019768, Tx: 223818). This club started to explore HEVIZ hot spring lake 20 years ago. This lake is well known from historical times as a medical lake (we found even some Roman Imperia coins and pottery in the lake) but the hot water source was unknown. At the beginning of this century divers from Trieste (Italy) were invited to find the hot spring but they could go only till 30 meters and could find a small dead cave. Twenty years ago a diver noticed that, there is a very small hole at the bottom of the lake (the visibility is nearly zero at that point, because the turbulent water and the mud form a totally dark melange at 40 meters). Divers cleaned the passage and discovered a large cave with crystal clear hot water. Fifteen years ago the lake started to cool. Some big mines near the lake take ground water away in very large quantities. A need raised to clear the passage, fix two large tubes from the cave to the hospital building and construct a double wall gate at the entrance of the cave with a measuring hole and pressure sensors. (Having a fix hole and measuring the pressure on the both sides /more exactly the pressure difference/, we can measure the water flaw without any moving part). Today - after many years of fighting - the mines are forced to close and water is getting warmer again. In the cave there is a chain of hot springs. The temperature is slightly different in each spring. Ten years ago we had a cold spring in the cave as well (17 C). At that time if you became overheated in the cave you could swim into the other part and have a cool bath. We could see two levels of water in the cave with different temperature. Now the cold spring disappeared. As you see, it was a big project for nearly 10 years. Working in the cave Amphora divers developed a special decompression timetable, because it turned out, having a decompression in a relatively "cold" water (20 C near the surface after 42 C in the cave) we needed an extra long "penalty" decompression time. We used air for diving and O2 for decompression. Heat difference was a problem near the surface. Coming from 42 C (in the cave) and spending 15-25 minutes at 45-49 meters we had to wait a very long time in 20 C. Somebody from Amphora proposed to build tents under the water with a direct hot water tube from the cave. It was built and after that divers were waiting for the next decompression depth in underwater heated tents. (Don't laugh it's true!!!) Dear Christopher, If you are interested in details please send me an E-mail, and I will fax you some additional materials. If you are interested to dive in Heviz please send me a mail or contact Amphora Diver Club directly. With kind regards Laszlo Abel - CMAS Instructor - Laszlo_Abel@ma*.CE*.ch* Reply to:------- >Hi Lazlo: >If you are in fact making these dives into thermal waters, I would be Very interested to know how you are controlling your overheating. >I have been looking at a high altitude geothermal spring here in Colorado for the last few years, but have never been able to come up with a satifactory way of not overheating on the dive. Christopher M. Parrett, President, Abysmal Diving Inc. Makers of ABYSS, Advanced Dive Planning Software. 6595 Odell Place, Suite G. Boulder CO, 80301 Ph, 303-530-7248, Fx, 303-530-2808 ftp://abysmal.com/users/abysmal http://www.emi.net/boynton/abyss/abyss.html
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