Seven bushwalkers spent Sunday night sheltering in a cave when a planned day hike in the Jamison Valley went wrong.
The hikers, aged between 27 and 69, had set off at 8.30am on Sunday and were last seen about 1pm on Narrow Neck Plateau, police said.
They were due to return at 5pm on Sunday but, when they still had not returned by 7pm, concerned relatives raised the alarm.
Police and emergency service workers launched a search on Sunday night from the Golden Stairs and scoured the area until 1.30am on Monday, but found no trace of the group.
The NSW Ambulance helicopter was also involved in the search until 1am.
One of the bushwalkers managed to get a weak mobile phone signal just after 7am on Monday and sent a text message to a relative saying they were safe and sheltering from the cold conditions in a cave south of Katoomba.
Inspector Ken Shack-Evans, from the Blue Mountains local area command, told ABC radio on Monday morning that none of the group was injured but their exact location had not been confirmed.
Police and emergency services met at the Narrow Neck car park at 8.45am on Monday to begin the retrieval operation and by midday a GPS location was provided to the search co-ordinator.
A Polair helicopter was sent to the search area and when they spotted the group, a rescue team reached them by foot and confirmed none of the bushwalkers were injured.
The group was guided out of the national park and reached the car park at about 5.30pm.