What are composting toilets, computers, and a restaurant doing suspended hundreds of feet above Ground Zero? In this short video, learn how an engineering conundrum allowed the steel company, DCM Erectors, to install modern amenities at the One World Trade Center worksite.

NOVA is produced by WGBH in Boston. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and PBS viewers.