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The lake water is strongly alkaline (pH 9.7–9.8) and rich in sodium carbonate and other salts, which are extracted by evaporation and used as detergents.
originally posted by: SlapMonkey
a reply to: rickymouse
The story says the it's the high alkalinity in the water that has helped keep it preserved. I don't know if that's an effect of the water being high in sodium carbonate, but apparently it is, when a relatively high Ph as well:
The lake water is strongly alkaline (pH 9.7–9.8) and rich in sodium carbonate and other salts, which are extracted by evaporation and used as detergents.
Wiki
The water level of the lake has often altered dramatically: near Tatvan, Felix Oswald (see Geology of Armenia, 1901) noted a raised beach high above the present level of the lake as well as recently drowned trees. Investigation by Degens and others in the early 1980s determined that the highest lake levels (72 metres (236 ft) above the current height) had been during the last ice age, about 18,000 years ago. Approximately 9,500 years ago there was a dramatic drop to more than 300 metres (980 ft) below the present level. This was followed by an equally-dramatic rise around 6,500 years ago.(2
Similar-but-smaller fluctuations have been seen recently. The level of the lake rose by at least three metres during the 1990s, drowning much agricultural land, and (after a brief period of stability and then retreat) seems to be rising again. The level rose approximately two meters in the ten years immediately prior to 2004
originally posted by: Skywatcher2011
Tisk tisk...all that hard work of building a castle gone to waste...errr, ruin. Such a shame to see a castle under water. Probably a war castle too. The mystery is how it came to going down under. Maybe the land sank due to a massive earthquake. Maybe built on artificial land which capsized? Interesting nevertheless.
S&F
originally posted by: jjkenobi
Wasn't the common practice throughout history to build your castle on high ground? On the tops of hills and plateaus for strength in defending? It seems pretty strange to have one built in such a low area.
The lake surface lies 1,640 meters above sea level.
originally posted by: SlapMonkey
a reply to: lostbook
People, or Merpeople?
originally posted by: jjkenobi
Wasn't the common practice throughout history to build your castle on high ground? On the tops of hills and plateaus for strength in defending? It seems pretty strange to have one built in such a low area.