The Stonehenge Alliance said it agreed the area needs more investment, but an alternative solutions should have been looked at.
Mike Birkin, acting chair of the group, called the world heritage site a “landscape without parallel”.
“It’s really a weight off the future of the Stonehenge world heritage site if this planning permission is revoked,” he added, explaining that to have the permission “hanging over it” would not be “good for the protection of the site”.
“In the current economic climate, it is a fantasy to imagine that government would want to invest in this scheme,” a group spokesperson added.
It references a report by the National Audit Office in 2019, which said the benefits of a tunnel were “uncertain”.
Stonehenge was declared by Unesco to be a world heritage site of outstanding universal value in 1986.
