The cousin of a man who is missing after a rave on Dartmoor says it is "not in his nature" to disappear.
Joel Andrews, 24, of Caldicot, Monmouthshire, was last seen in the early hours of 22 May at the Fernworthy Reservoir area near Chagford.
His friends and family have joined Devon and Cornwall Police and the Dartmoor Rescue Group in their search.
Emma Scott, Mr Andrews' cousin, said he would have wanted to see his sister, who was visiting from Germany.
"It's not in Joel's nature to not contact his family," she said.
"She was coming over for a visit and I know that he would have wanted to see her and his niece."
Police have appealed for a group of six people seen "wading...fully clothed" at Fernworthy Reservoir between 1330 BST and 1500 BST on the day Mr Andrews disappeared.
A spokesman for Devon and Cornwall Police said: "We are keen to speak to the members of this group as they may have vital information that could help us find Joel Andrews".
Mr Andrews was last seen wearing a grey Animal hooded top and jeans and a dark green waist-length jacket.
Det Insp Brett Mitchell, who is leading the inquiry, said: "We now know that Joel was last seen at midday on Sunday 22 May and he was still at the site where the rave was held.
"I would urge anyone who attended and may have seen Joel to please contact police as they may have a vital piece of information that will allow us to find him."
A Facebook page has been created by friends who joined the search for Mr Andrews.