"The
Institute for Science and
International Security said
that the alterations suggest
Iran is taking steps to
protect the facility from
potential US or Israeli aerial
strikes or ground raids. It
noted that backfilling the
tunnels would dampen the
effects of airstrikes and
complicate special forces
operations intended to seize
or destroy sensitive
materials, such as highly
enriched uranium, that may be
stored in the tunnels. While
it cannot be confirmed, it is
possible that Iran has moved
equipment or materials into
these tunnels for protection,
said the organization." FULL
STORY at above link.