At the point where ice stops is a narrow entrance into passage called Grma . If ice breaks, it could close the entrance. The meander is easy to pass in its middle part, but in the lower part is very narrow. On the whole part from Grma till Monzunova achta one could not see the ceiling. Baldachyn is a side passage with a wig where, in need, is possible to make a bivouac.
Stream starts here, than stronger or weaker, flows through whole lower part of the system.
Lukina jama is its morphology. It is characterised by vertical shape and great depth of -1392 m. For ecological point of view it is interesting for three micro climatic layers, firstly entrance icy part with the temperature of about 1 C, secondly, middle part with the temperature up to 2 C and bottom part with temperature till 4 C. Important ecological factor is presence of smaller water stream starting at 550 m of depth till the bottom, where are submerged passages. Different organic remedies at rocks in this part of the cave draws a conclusion that water floods space up to several meters above the lowest, summer level. The most important discovery is that of finding endemic stygobiontic leech noticed by Ana Sutlovi .