Talk:Pechera Optymistychna

What is the source of the 230-km estimate for length? Do you have recent information or personal knowledge? My information is third hand---I based the 214-km estimate in the related article on a table of cave lengths that is sourced and appears to be frequently updated. The difference is currently significant because 214 km would tie it with Jewel Cave for second place; 230 km would put it alone in second after Mammoth. --Paul Stokstad