A horizontal tunnel 3x4m in diameter stretches for about 20m, then roughly horizontal under slot in roof to ramp up to c. The NNE and SSW entrances (a nd c) are slopes which can be scrambled. The middle entrance is a pitch, ~5m
Cool, dry (even though the previous week was all rain) and no draft. Presumably hidden by snow plus in previous years.
B leads in two rubble-filled sloping leads below ent c, may repay gardening of brick-sized rocks, but no draft.
It would make a good thunderstorm/heatwave refuge or bivvy cave (with a bit of gardening).