The simulation, which mimicked the look and feel of the Trinity explosion, was watched by over 100 spectators. It was organized by the San Francisco-based Simnuke Project as part of a memorial to the atomic age. Other events include a nuclear-related art show that runs at the Rx gallery in the city until 10 August. Members of the project also plan to plant 60 trees -- one for every year since 1945 -- near the Los Alamos laboratory in New Mexico, where the first atomic weapons were built.

"Bringing together the events of 60 years ago into the present can be a tool for protest and healing," says project director Camron Asadi. "By creating a close connection with the destructive nature and history of nuclear weapons, we aim to make peace the higher option."