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Molnar Janos Cave is exclusively open to certified cave divers. At minimum, you need a Full Cave Diver certification from a recognized agency such as NACD, NSS-CDS, TDI, or IANTD. The cave system includes significant overhead environments with complex navigation requirements. All divers must also complete a mandatory orientation dive with a locally certified guide familiar with the system. No exceptions are made regardless of general diving experience.

The cave is fed by thermal hot springs that rise from deep within the earth's crust beneath Budapest. Budapest sits on a major geothermal zone, the same system that feeds its famous bathhouses. The water temperature in the cave remains a consistent 22 to 26 degrees Celsius year-round. This thermal water is rich in dissolved minerals, which contributes to the exceptional visibility and creates unique mineral formations on the cave walls and ceiling.

The explored passages of Molnar Janos Cave extend for over 600 meters with multiple large chambers connected by passages of varying size. The main chambers are impressively spacious, some exceeding 10 meters in height and 20 meters in width. Maximum depth reaches approximately 30 meters in the deepest sections. Ongoing exploration continues to reveal new passages and chambers, and the system is believed to connect with other thermal cave networks beneath Budapest.