Treasures unearthed by hundreds of archaeologists so far during work on the controversial planned HS2 train line have been shown exclusively to the BBC. The 450,000 objects, which are being held in a secret warehouse, include a possible Roman gladiator's tag, a hand axe that may be more than 40,000 years old and 19th Century gold dentures. It is an unprecedented amount and array of items, which will yield new insights into Britain's past, says the Centre for British Archaeology. Major building developments in the UK need land to be assessed by archaeologists as part of the planning process, to protect heritage sites. Since 2018 around 1,000 archaeologists have been involved in 60 digs along the route HS2 is set to take between London to Birmingham.