Inside entrance, rubble slope drops down to short pitch into chamber. Chamber is ~20ft deep from entrance. One wall is steeply inclined, chamber may continue underneath. At (illegible) there may be a continuation: a narrow gully appears to twist off to the left. Above is an eye-hole through which there appears to be blank space. Further round from this entrance and lower down, there is a large depression with a small snow-plug on the floor, with a crawl at the bottom (very small technical QM) - looks like lots of water comes down it - disappears into a choss bowl.