A crane places the fourth tier of the Crew Access Tower.
A crane lifts the fourth tier for placement at Space Launch Complex-41 to form the Crew Access Tower under construction by Boeing and United Launch Alliance. The steel structure is being built in seven pieces that will be stacked atop each other to form a 200-foot-tall tower complete with elevator, communications and power infrastructure, and an escape system. The tower will provide astronauts and ground support teams access to Boeing’s CST-100 Starliner spacecraft, in development in partnership with NASA’s Commercial Crew Program. Photo credit: NASA/Jim Grossmann