At 20:45 on Saturday 28th July 2012, SMWCRT was made aware that a party of 4 adult cavers on a through trip from OFD 2 to 1 and due out at 20:00 were overdue

After initial checks were made to confirm that they had not returned and forgotten to sign in, search parties checked the main routes in OFD 1 and Cwm Dwr without success. More rescuers were called out to start a more thorough search of side routes but were stood down when the missing party appeared at 02:15 on Sunday morning, having spent 15 or so hours underground.

The party had struck route finding problems near the end of the trip and turned around near the OFD 1½ Connection, reversing their entire days journey to exit via OFD 2 (Top Entrance)