The Runit Dome was constructed in 1979 to temporarily store radioactive waste produced from nuclear testing by the United States military during the 1950s and 1960s.
The Marshallese community raised concerns over damage to the dome after Typhoon Nangka hit in July causing significant damage to homes and infrastructure on the atoll.
Our correspondent, Giff Johnson says the team surveying the dome found the cracks have been developing over time.
