Concerns have been raised that these tunnels could potentially be used to conceal stockpiles of highly enriched uranium and advanced centrifuges capable of enriching uranium to weapons-grade levels.

The newly constructed tunnels are reportedly deeper than Iran's existing enrichment plant at Fordow, making them potentially more resilient to airstrikes or sabotage attempts.

Iran is significantly reinforcing two underground tunnel complexes linked to its main nuclear facility, establishing a new security perimeter amid ongoing threats of military action from the U.S. and Israel.

These developments come as the U.S. and Iran prepare for a third round of diplomatic talks, following two previous rounds that were described as 'constructive.'

Iranian President Masoud Pezeshkian has expressed openness to negotiating with the U.S., provided that Iran's national priorities are respected.

Since the U.S. withdrawal from the nuclear agreement, Iran has violated several terms, raising suspicions among Western powers regarding its nuclear ambitions.

U.S. President Donald Trump has threatened military action against Iran if a swift deal is not reached to curtail its nuclear ambitions.

Recent reports indicate that these fortifications near Natanz are part of Iran's broader efforts to enhance security around its nuclear sites.

The new security perimeter connects to existing measures surrounding the Natanz nuclear plant, highlighting Iran's integrated approach to securing its nuclear facilities.

Iran has not allowed U.N. nuclear inspectors access to these complexes, raising concerns about the potential storage of undeclared nuclear materials.

Commercial satellite images from late March revealed fortified entrances and construction activity around the complexes, indicating significant progress in their development.

Iran plans to utilize the new underground complex for centrifuge assembly activities, replacing a facility at Natanz that was damaged in a 2020 sabotage incident.