Located in Spa Park and next to the Waikato River. This cache
can be accessed from a number of tracks in Spa Park including along
the river from 'Some like it Hot' (GCGB5B). The cache is right
beside a track so there is no need to go cross country. The most
interesting access point is 320 meters down County Ave (off Spa
Road) at the Trail Head waypoint. The cache is a camouflaged 2
Litre container. A large cave can be found 60 meters to the north
of the rock.
According to
Taupotiger the history of the rock is as follows:
This area was untill the late 1950s, early 60s very geothermally
active. All the cliffs from where Taupo bungy is now to the hot
stream had steam pouring out of them. The area was known as Hells
gate. You couldn't go into the cave, there was too much steam
pouring out of it. Steam from the cliffs regularly made driving
difficult on Spa Road. There were several geysers in the area, two
on the spa park side of the river, and three or more on the other
side on the flat area opposite Taupo Bungy, most notably the CROWS
FOOT geyser. Cavity rock is the throat of one of these extinct
geysers. It is a silica deposit left from the geyser.
The opening of the Wairakei Power station in 1954 spelt the end
of a lot of the geotheral activity in the Taupo area, especially
the Spa thermal Park.