Halligye is the largest and best preserved of all the fogous with one 20.7m curving passage out of 39m in total. It shows most of the characteristic signs: its entrance faces south east; it is associated with a round; it has side passages and creeps; it has narrow archways inside and, in addition has a ‘stumble step’ perhaps designed to trip up an attacker. A normal height person can stand throughout most of its length but parts of it are definitely for the potholers.

It is situated on the Trelowarren estate and, being home to some horseshoe bats, is closed in winter. A torch is essential.

It seems that there was an antiquarian entrance into the curved passage but this was blocked up during reconstruction. The English Heritage site graphic suggests that the modern south eastern entrance might also have been the original entrance. Experience of other fogous suggests that this is correct.

In front of you as you enter the straight passage is a 0.5m high inner archway and, on your left, another 1.1m arch through giving access to the main curving passage.

The first 0.5m high arch requires a competent limbo dancer … and leads to a creep passage.

… beyond it, on the left, the second arch is rougher and slightly taller.

The stumble step at the end of the curving passage is obvious, just before a low arch on the left hand side leading to the creep.

Halliggye is on the Trelowarren estate which helpful signposts it, until the last minute. The fogou entrance is here. While you can drive right up to the fogou, a better parking place is here.