Satellite images showed that Iran was building a new plant to collect centrifuges at the underground nuclear facility, Natanz, after it was attacked last summer, which Tehran described as a "sabotage attack."
The photos - published by the Plant Labs Foundation - showed that, since last August, Iran has built a new road south of Natanz towards what is believed to be a former firing range for the security forces at the enrichment facility, and the photos also showed the presence of construction equipment there.
Iran's mission to the United Nations did not respond to a request for comment on the satellite images.
And the head of the Iranian nuclear agency, Ali Akbar Salehi, told state television last month that the destroyed facility on the ground had been replaced by another in the heart of the mountains around Natanz.
Last month, Iran allowed International Atomic Energy Agency inspectors to inspect nuclear sites suspected of undeclared nuclear activities at the turn of the millennium.
At that time, the spokesman for the Iranian Atomic Energy Organization, Behrouz Kamalondi, expressed his hope that the inspection process would contribute to withdrawing all justifications from the United States of America that seeks to politicize the Iranian nuclear file, and to stop its pressure on the International Atomic Energy Agency.
US intelligence agencies and the International Atomic Energy Agency believe that Iran has a secret nuclear weapons program that it halted in 2003 for fear of being discovered, while Tehran has long denied seeking to build atomic bombs.
But according to its obligations to the International Energy Agency, Iran - which denies its intention to possess an atomic bomb - is forced to accept the required inspections, according to experts.
It is noteworthy that the United States withdrew in 2018 from the nuclear agreement signed by Iran and international powers in 2015.
The agreement provides for guaranteeing the peaceful nature of Iran's nuclear program in exchange for the lifting of international sanctions.
In response to the US withdrawal from the agreement, Tehran has resumed uranium enrichment and the use of centrifuges more sophisticated than those allowed by the agreement.