Castor Cave


Castor Cave is part of the “Gemini Caves” and is one of two complex caves with side by side entrances. The first is “Pollux Cave”, the second being “Castor Cave”. Neither cave overlaps.

After traversing a section of collapsed rock and debris under a low ceiling, Castor Cave expands into a primary chamber, from which three distinct passages diverge. The chamber boasts a ceiling height of nearly 2 meters and features a striking ropey pahoehoe lava fall with a gentle slope.

The northern passage is narrow and terminates abruptly. The eastern passage initially appears to be a dead end, but the constriction is temporary, with a height of only 0.4 meters. Partially obstructed by rubble and ascending at a 15% gradient, the passage turns north and widens slightly to a height of 1 meter. A westward turn is followed by a significant narrowing. The passage extends for some distance, estimated at 20 meters, but is impassable due to its narrow width.

Returning to the main chamber, the final passage heads west. After navigating blocks, rubble, and a lava roll, the cave opens up to a height of almost 2 meters. The fall is concealed beneath a mound of collapsed rock. Here, two additional passages branch out—one north, one south—alongside three small skylights (too small for entry or exit).

The spacious northern passage allows for easy navigation but terminates after approximately 15 meters. The southern passage narrows rapidly, with a height of only 0.6 meters. Although the passage continues for a considerable distance, further exploration is hindered by its restricted width.

Cave Type: Lava Cave
Location: Auckland Volcanic Field
Surveyed: Yes