A worker from Canaveral Construction in Mims re-grades a section of the lime rock on the crawlerway at NASA's Kennedy Space Center.

A worker from Canaveral Construction in Mims, Fla., re-grades a section of the lime rock on the crawlerway near Launch Pad 39B at NASA’s Kennedy Space Center in Florida.

The crawlerway is being upgraded to improve the foundation and prepare it to support the weight of NASA’s Space Launch System, or SLS, and mobile launcher on the crawler-transporter during rollout. Workers are removing the original Alabama river rock and restoring the layer of lime rock below to its original depth. Then new river rock will be added on top. The Ground Systems Development and Operations, or GSDO, Program office at Kennedy is leading the center’s transformation to safely handle a variety of rockets and spacecraft. For more information about GSDO, visit: http://go.nasa.gov/groundsystems. Photo credit: NASA/Jim Grossmann