Battelle has started building a movable shelter to help counter radioactivity at the Chernobyl nuclear power plant site in Ukraine.
The institute said the steel structure will weigh as much as three Eiffel Towers when complete.
Construction work is part of an estimated $2 billion shelter implementation plan backed by funds from more than 30 nations in support of the Chernobyl Shelter Fund.
The Colombus, Oh.-based firm said the shelter will help mitigate radioactivity throughout the next century and help with cleanup operations.
Once complete, the structure measuring 250 meters wide, 150 meters long, and 100 meters tall will cover an existing object shelter currently containing a nuclear reactor.
Battelle expects to finish the project by 2015.