document: John Lawton, 62, from Alsager, was last seen in an off-road race near Kalamata, in southern Greece in April.
  Nine people from Cheshire Search and Rescue returned for a second time to the country on Friday.
  The team said they covered a vast area of "unforgiving terrain" on Saturday, in temperatures of up to 44C.
  A spokesperson said the search included olive groves and river beds around Aghia Sofia.
  The six-day search has been funded thanks to an  
            online campaign
  , which has now raised more than Â£16,500.
  During the last hunt in May, rescuers found discarded energy gel packs which DNA analysis later showed had been used by Mr Lawton.
  A spokesperson said the team members "remain positive" and are doing everything they can to find him.
summary: Volunteers searching for a missing runner in Greece have said they remain "positive" despite a second attempt to find him so far proving unsuccessful.