As a local resident I have read reports about the A303 Stonehenge tunnel with a high degree of suspicion.
There was an alternative proposal, the Parker Plan, put forward at the public inquiry, which had a great deal of local support.
The proposal would have routed the A303 south of Stonehenge and also made improvements to the A36.
It could also have created the possibility of a much-wanted A36 bypass for Salisbury (another proposal that suffers from Government inaction).
Part of the case for this imaginative proposal was exactly the reason that the Highways Agency is now giving for not proceeding with their original tunnel proposal ? hydrology and the problem of disposal of vast quantities of chalk.