Duncan Collis, expedition 1995, 1996, 1997, and 1998 and 1999. Came along at just the time when the furthest reaches of Kaninchenhöhle were getting too far for most people to contemplate, and then 161d changed all that. One of those responsible for revisiting Siberia in 1997 and descending the 70m Somebody Else's Problem. In 1998, he and Steve Bellhouse pushed this down another large pitch, Midnight in Moscow, and a series of shorter drops to a pretty definite conclusion at a new deep point of 533m (527m below the original entrance).

Now also a member of the Technical Speleological Group at "The Chapel" in Castleton, in England's Peak District.