The innermost part of Grotta Regina consists of a meandering and muddy gallery, ending with a 5 m (16 ft) deep pit, after that the farthest point from the entrance is reached.

A secondary branch leads to the Queen's Idol (Italian: Idolo della Regina), a 2 m (6 ft 7 in) high stalagmite that's the most important limestone formation and the symbol of the cavity.

Immediately, with some difficulties, cavers began to unblock the entrance and explore the cavity, discovering the most extended and beautiful cave in the Gorizia Karst.

In the same year, cavers realised the survey of the cave, named Grotta Regina del Carso (Slovene: Jama Kraljica Krasa).

Moreover, small lakes, dropping bowls and gours host many stygobites species belonging to roundworms, worms, copepods, Bathynellacea and amphipods.

[2] The cave is the type locality (the place where the specimens were originally collected) of the diplurian Metajapyx peanoi (Pagés, 1980),[3] a troglobite species known only living in this cavity and Grotta delle Radici in the Trieste Karst.