South Yorkshire Police and Greek Authorities are to excavate the site from where toddler Ben Needham went missing in July 1991. A team of search experts are to start the excavation tomorrow in a bid to eliminate the possibility that Ben came to any harm at the scene.
The team will use sonar equipment and specially trained dogs to scour the site, which is in the village of Heracles on the island of Kos.
The excavation of the site could take a week or longer.
Ben was with his grandparents on the day he went missing - his grandad Eddie was helping to renovate a farmhouse in the remote countryside when he vanished without trace.
Despite a massive 21-year campaign by his mum Kerry, there has been no trace of him since.
Kerry is apprehensive about the dig, but hopes it will prove her theory that Ben was abducted.
Calendar presenter Duncan Wood, along with producer Mark Witty and cameraman Simon White, will send a full report for Calendar at 6pm, including an exclusive interview with Kerry and the South Yorkshire detective in charge of the case in the UK, Det Supt Matt Fenwick.