Police are appealing for swimmers who may have seen a missing man on Dartmoor to contact them.
Joel Andrews, 24, of Caldicot, Monmouthshire, was last seen at a rave near the Fernworthy Reservoir in the early hours of Sunday 22 May.
Police say a group of people swimming in the reservoir on Sunday morning may have "vital information".
Mr Andrews' family, who have joined the search, said in a message to him: "We just want you home."
Officers say Mr Andrews' disappearance is out of character.
A spokesman for the Devon and Cornwall force said: "We are keen to trace these swimmers as they may have vital information that could help us find Joel Andrews."
Mr Andrews' family said in a statement: "We would like to ask anyone who has seen or heard from Joel to please get in contact with the police.
"Even if you think it sounds silly, it could mean a lot. Just a little bit of information could lead to a big thing.
"And Joel, if you read this, please come home. We are not angry with you, we just want you home.
"We love you so much and need you home."
A Facebook page has been created by friends who joined the search for Mr Andrews.