On September 13, 2013, two recreational cavers, Rick Hunter and Steven Tucker, discovered a previously unknown, remote chamber within the well known Rising Star cave system. Discovering the floor of this chamber (now known as the Dinaledi Chamber or UW-101) littered with human-like bones, the pair reported their finds to a colleague, who in turn brought them to the attention of Berger. Recognizing their importance, and unable to access the chamber himself due to his size, Berger organized an expedition over social media that brought six qualified researchers in from around the world to commence an excavation of the remains in November 2013. An early career workshop was organized in May 2014 that brought together 54 local and international scientists to describe and study the more than 1550 fossils recovered. In September 2015, the team announced "Homo naledi" as a new hominin species, citing its unique mosaic of more ancestral and human-like traits. Other fossil bearing localities in the system were given the site numbers 102 to 104, though research regarding them has not yet been published.