Since the towers were still under construction, Petit and one of his collaborators, New York-based photographer Jim Moore, rented a helicopter to take aerial photographs of the buildings. Two more collaborators, Jean-François and Jean-Louis, helped him practice in a field in France, and accompanied him to take part in the final rigging of the project, as well as to photograph it. Francis Brunn, a German juggler, provided financial support for the proposed project and its planning. Petit and his crew gained entry into the towers several times and hid in upper floors and on the roofs of the unfinished buildings to study security measures. They also analyzed the construction and identified places to anchor the wire and cavalletti. Using his own observations, drawings, and Moore's photographs, Petit constructed a scale model of the towers to design the needed rigging for the wire walk. Working from the ID of an American who worked in the building, Petit made fake identification cards for himself and his collaborators (claiming they were contractors who were installing an electrified fence on the roof) to gain access to the buildings. Prior to this, Petit had carefully observed the clothes worn by construction workers and the kinds of tools they carried. He also took note of the clothing of office workers so that some of his collaborators could pose as white-collar workers. He observed what time the workers arrived and left, so he could determine when he would have roof access. As the target date of his "coup" approached, he claimed to be a journalist with Metropolis, a French architecture magazine, so that he could gain permission to interview the workers on the roof. The Port Authority allowed Petit to conduct the interviews, which he used as a pretext to make more observations. On the night of Tuesday, 6 August 1974, Petit and his crew had a lucky break and got a ride in a freight elevator to the 104th floor with their equipment. They stored it 19 steps below the roof. To pass the cable across the void, Petit and his crew had settled on using a bow and arrow attached to a rope. They had to practice this many times to perfect their technique. They first shot across a fishing line, which was attached to larger ropes, and finally to the steel cable. The team was delayed when the heavy cable sank too fast, and