[5] At the initiative of Perko and Putik in 1910 in Ljubljana the Cave Exploration Society (Društvo za raziskavanje podzemskih jam in Slovenian, Gesellschaft für Höhlenforschung in German) was founded.

[10] In 1911 Drenovci, within Lower Carniolian Section, began to identify underground inflows into the Krka river and therefore set out to explore the deep abysses, in order to reach the water caves below.

His artistic depiction of mountain and cave scenes, often in pictorialist style attracted many to photography, first of all Ivan Tavčar and Josip Kunaver.

Pavel Kunaver, as a non-commissioned officer of the Austro-Hungarian army, participated in the exploration and adaptation of caves in the Karst area for military needs.

DZRJL activity resumed in 1924, the society changed focus from topographical discovery of the underground to the scientific study of karst phenomena.

Under the leadership of Ivan Dolar, they systematically explored caves in the wider surroundings of Logatec and penetrated to the end of Blata branch in Križna jama.

[20] During the Second World War, Valter Bohinec and Jovan Hadži hid the society's archive in the premises of the National and University Library in Ljubljana.

To conform to the statute of the Speleological Association of Yugoslavia, which required cover organization in every of the Yugoslavian federal republics (regions), DZRJL was renamed to Cave Exploration Society of Slovenia (DZRJS).

[18] In 1960, the members of the society explored Brezno pri Medvedovi konti on the Pokljuka plateau with one of the largest known cave halls at that time.

The cave, discovered by Putik in 1886 as Lipertova jama, later lost and in 1937 rediscovered and renamed by Šerko, was 200 meters long, but had a passage with strong air current, too narrow to pass, at the end.

A new society's depth record in an own cave was achieved in Primoževo brezno, -197 m. A large team took part in the expedition to Pološka jama, where JKLM members discovered the main continuation.

The expedition reached the previously known bottom of the cave, at −346 m and continued through a long low horizontal tunnel, till the Slovenian siphon, at −361 m, according to the new survey.

[36][37] As the pit depths were only estimated, the task of the DZRJL expedition, which included Yeti, was to survey the cave and to search for an eventual continuation.

By 1979 he developed the software tool for the 3D model and from 305 vertices in 51 cross sections the parameters for this cave were computed: length 205 m, surface area 8900 m2 and volume 6,500 m3 with error estimate below 5%.

[40][41] In 1984 Daniel Rojšek of DZRJL and his team used this method to survey a 54 m long segment of the large Martel's Hall at the end of Škocjanske jame caves.

From 1985 to 1988 society members visited Antro del Corchia (-1210 m, in the Apuan Alps) and Spluga della Preta (-877 m, on the Lessinia plateau above Verona).

Kanin, at the time the deepest Yugoslavian cave, where the Slovenian team reached a depth of 911 m. At the invitation of the cavers from Trieste, in October Franci Gabrovšek and Gregor Pintar took part in the "-1000" campaign in the Črnelsko brezno on Mt.

DZRJL team discovered the entrance to the cave Vandima (grape harvest in Slovenian littoral dialect, from vendemmia in Italian) on Mt.

In 1999 14 field trips deepened this cave to 750 m and Marjan Baričič discovered the P 4 or Brezno rumenega maka [The Abyss of the Yellow Poppy].

DZRJL withdrew all the documents made by its members from the common archive, replaced them with replicas and, after the last attempt of reconciliation failed, left JZS.

In 2008 the exploration in the Sleeping Dinosaur continued to the depth of 300 meters, where the Brezno T-Rex (Tyrannosaurus Rex Abyss) ended in a collapse cone.

At the initiative by Matt Covington exploration on Pokljuka mountain plateau began with the cave Evklidova piščal [Euclid's flute], elevation 1550 meters.

In 2007 Rok Stopar, of Dimnice caving society (Koper) free-dived in the siphon of Renejevo brezno, at -1240 m. He discovered that the submerged tunnel of reasonable proportions continues 1 m below the surfaces, with clear water.

[55] At the end of May 2015 the cave Brezno na Toscu, elevation 1965 m, above the Pokljuka plateau in the Julian Alps, discovered and registered in 1959, with a 100 meters deep entrance pit, was explored.

[59] In the beginning of 2019 an idea to find a new, reasonably small speleologically unexplored area in NW Slovenia, where many new caves could be found within limited time and effort, circulated at the society.

[46][60] In April 2019 three DZRJL members, Matic Di Batista, Špela Borko and Jure Bevc took part in the expedition to the Chevé Cave in Mexico.

Two days before the end of the society's summer camp on Kanin, which failed to meet the expectations, a survey team of four discovered a window above the terminal shaft on the north side of the bottom T-Rex hall, at -300 meters.

[62] In 2022, from May Day to the end of the year, a new cave close to Robidišče, a village at the far western edge of Slovenia, 200 meters from the border with Italy, was discovered and explored.

Glas podzemlja [Voice of the Underground], the society's less formal annual publication, is a reflection of the time and activities of the DZRJL members.

[78] The first Caving Handbook (Jamarski priročnik in Slovenian), the only complete one, was published in 1964 by the publishing house Mladinska knjiga in the collection Nature and People, but it was written by nine authors, all members of the society: Ivan Gams, Zdravko Petkovšek, Miran Marussig, Jože Štirn, Boris Sket, France Osole, Franci Bar, Uroš Tršan and Valter Bohinec.