Two engineers evaluate the Emergency Egress System as they ride in folding seats attached to slide wires at Space Launch Complex 41. United Launch Alliance and Boeing continue modifications to the pad in order to host missions by the Boeing CST-100 Starliner carrying astronauts and crew. The system recently completed its final test. In the unlikely event of an emergency prior to liftoff, each person on the Crew Access Tower would get into their own seat attached to the wire and slide more than 1,340 feet to a safe area. The wires are situated 172 feet above the pad deck on level 12 of the tower. The Starliner will launch on a ULA Atlas V on mission to low-Earth orbit including those flying astronauts to the International Space Station during missions by NASA's Commercial Crew Program.