Iranian state television broadcast footage of a new Revolutionary Guard base, which is described as a "missile area" armed with cruise and ballistic missiles.

The video from Monday's broadcast reveals what appear to be advanced munitions inside the underground building, including dozens of missiles lined up along concrete walls outside the base, houses electronic warfare facilities, such as radar, tracking devices, and simulation and disruption systems, according to the Guard.

On the broadcast, Revolutionary Guards commander Gen. Hossein Salami said, "What we see today is a small section of the great and vast missile capability of the Revolutionary Guards' naval forces."

The exact location of the base was not revealed in the state TV broadcast, but it is thought to be one of many underground bases constructed by the Islamic Revolutionary Guard along the Gulf coast as tensions with the US, Israel, have risen.

“Iran's display of missile capabilities fits in with wider attempts to maintain pressure on Washington in response to extensive US sanctions,” said Torbjorn Soltvedt, principal MENA analyst at Verisk Maplecroft, in an interview with CNBC on Tuesday. Iran's attempts to put a price on US sanctions in the areas of nuclear, missile and regional security continue at a rapid pace.

Both Washington and Tehran have expressed a willingness to return to the 2015 Joint Comprehensive Plan of Action. The Iranian nuclear agreement provided Iran with economic relief in exchange for restrictions on its nuclear program but each side needs the other to make compromises first.

If Iran is to participate in negotiations, it demands that the US should lift sanctions. The Biden team says sanctions will not be lifted until Tehran stops violating the nuclear agreement. These violations include the uranium enrichment and stockpiling beyond the JCPOA's parameters, restricting UN inspector access to nuclear facilities, and manufacturing uranium metal, which can be used in a nuclear weapon.

Under the Trump administration, the US rejected the nuclear agreement, enforcing strict sanctions that have crippled Iran's economy and currency. The "missile capital" raises concerns about how the United States and Europe could resurrect the nuclear agreement.

 “Iran's growing missile capability is also a complicating factor for the Biden administration as it considers the probability of a US transfer to the JCPOA,” Soltvedt said.

 Iran has invested heavily in indigenous missile production and has one of the largest missile programs in the country, despite lacking the advanced air force of some of its regional neighbors such as Israel and the United Arab Emirates.

 “The IRGC, in general, puts a lot of focus on using missiles to project power,” said Jeffrey Lewis, director of the Middlebury Institute of International Studies at Monterey's East Asia nonproliferation program. The missile city is "reflective of how important conventional missiles are to the IRGC Navy in projecting its strength into the Gulf."

 Critics of the 2015 settlement, like Gulf Arab states, want President Joe Biden to take a more holistic approach to confront and restricting Iran's missile operation.

 According to Soltvedt, this poses a problem for Biden's team: "Incorporating problems like Iran's ballistic missile programme would make a new nuclear agreement far more difficult to achieve." However, failing to include them would jeopardise ties with main regional security partners.”