Cave entrance
Tank Cave
Advanced Cave: CDAA site rating [1] [3] (Access to the system is restricted to CDAA Advanced Cave divers.). These categories are the named scheme's own; they describe the training a site calls for.
The CDAA-owned main entrance to the Green Waterhole - Tank Cave system, a low maze of flooded passages. Restricted to CDAA Advanced Cave divers with a site access officer present.
Tank Cave is entered through an underground opening that once had a water tank above it. A short ladder leads down to a small pool, which opens into a maze of interconnected passages. A guideline runs through most of the cave, but many side passages can only be reached by bridging between lines, which is why the CDAA reserves the site for Advanced Cave members and uses it for Advanced Cave assessment dives.
The CDAA bought the land over the entrance in 2010 and manages all diving here. Diving days are booked through the CDAA and need a qualified site access officer, and new visitors follow a familiarisation schedule before diving the wider system.
The environment
Fresh water in a maze of intersecting phreatic passages, with a fixed line through much of the cave and many side passages reached by jumps.
Other entrances to Green Waterhole - Tank Cave system
For orientation, not navigation. Hollow dots are approximate.
Every fact on this page, with its source (7)
| Fact | Status | Source |
|---|---|---|
| The CDAA rates Tank Cave Advanced Cave and restricts the system to Advanced Cave divers. | Verified | [1] [3] |
| A suitably qualified Tank Cave site access officer is required for each diving day, and a familiarisation schedule must be followed until completed. | Verified | [1] [2] |
| Tank Cave is open most weekends and by request of a site access officer, with bookings through the CDAA website and at least one week's notice. | Verified | [2] |
| The CDAA booking page lists Tank Cave at AU$20.00 per diver per day.Price shown on the live booking page on 2026-10-14; may change. | Verified | [1] |
| The CDAA bought the land over the primary entrance in 2010 and manages access through it. | Verified | [1] |
| Coordinates are the Tantanoola locality centre, not the entrance.Entrance location deliberately withheld (private land). | Verified | [4] |
| Coordinates are the Tantanoola locality centre, not the entrance.Entrance location deliberately withheld (private land). | Verified | [4] |
Verified: stated by an official or primary source we opened. Reported: from a secondary source only. Sources conflict: the note gives both versions. May be out of date: the newest source we found is old.
Written in our own words from the sources above. Report a correction