An excellent analysis by Kate Fielden(CPRE) in the Ecologist on that fraught subject of the tunnel by Stonehenge.
The government’s plans to tunnel the A303 under the Stonehenge World Heritage Site has one grievous flaw, writes Kate Fielden. The tunnel is too short, so huge portals and graded junctions at both ends would lie entirely within the WHS causing huge damage to landscape and wipe out archaeological remains...
See the article at:
Interesting as to the effect the proposed tunnel will have on the landscape given that there are always new finds. Late Mesolithic settlement at Blick Mead.
bbc.co.uk/news/uk-england-wiltshire-30540914