UIS Commission on Karst Hydrogeology and Speleogenesis

A recent publication of Spanish researchers describes the biology of Krubera Cave, including the deepest terrestrial animal ever found:

Jordana, Rafael; Baquero, Enrique; Reboleira, Sofía and Sendra, Alberto.
Reviews of the genera Schaefferia Absolon, 1900, Deuteraphorura Absolon, 1901, Plutomurus Yosii, 1956 and the Anurida Laboulbène, 1865 species group without eyes, with the description of four new species of cave springtails (Collembola) from Krubera-Voronya cave, Arabika Massif, Abkhazia.
Terrestrial Arthropod Reviews 5 (2012) 35–85.

DOI: follow this link

(information supplied by Sofia Reboleira)