Workers on the basemat below adjusted cables, slings, braces and shackles in order to perfectly balance the loads, while the crane operator-connected by radio from his cabin-slowly lifted each component. The operation, which lasted some ten days, was a mix of brute force, high technology, and skill. From its extended boom, a large hook passed through an opening in the roof and was lowered 43 metres to the basemat below, where four girders and their motorized trolleys were lined up for lifting. In June, a powerful crawler crane was positioned outside of the Assembly Building in order to raise and position the main elements of the overhead lift system. That’s what the recently installed Assembly Building bridge cranes will be capable of handling when operated together.