Ogof T1

Location
Grid Reference: Not known

Altitude: Not known

Exact location not known; somewhere in the Penderyn/Ystradfellte area. Beyond a farm gate and close to a farmhouse.

The author of this article speculates that from the descriptions and name of the cave, it is likely to be in the vicinty of Tir-yr-onen farm which is marked on 1:25,000 OS maps in grid square SN 9612. There is a nearby site recorded in the Cambrian cave registry: Upper Hepste, Tir-yr-Onnen Sink.

Access
No access. Entrance blocked and access denied by landowner.

Description
Length: about 2.5km (not surveyed)

Vertical range: not known.

Apparently varied caving including a 15m pitch, crawling, stooping, walking, streamways and formations. Resurges in the Hepste valley, some 2.5km away.

History
Dug and exlored by Tony Donovan, Richard Frost and others in 2010. Blocked by landowner following removal of the cave gate in November 2010. The exact location was never publicly disclosed as the owner apparently wished to keep the find secret.