Duncan Collis, expedition 1995, 1996, 1997, and 1998, 1999, 2000, 2001, 2002 and 2007. 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).
In 1999, he and Anthony Day along with Mick Thompson found the entrance to Steinbrückenhöhle, which was to become the focus of the next several years' expeditions. In 2001 and 2002 he was involved in pushing Razordance, finally reaching the bottom at a depth of 596m from the 204a entrance during the big push of 2007.
Now lives in China as a member of the Hongmeigui Cave Exploration Society.