![](../art/multimedia/missionprep/265118main_trench2_full.jpg)
Workers spray a coat of heat-resistant concrete called Fondue Fyre onto steel grid structures that are welded to the wall of the flame trench
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![](../art/multimedia/missionprep/265407main_slope_full.jpg)
A worker smooths the surface on the slope of the flame trench Pad 39A
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![](../art/multimedia/missionprep/269358main_testtrench_full.jpg)
In the Launch Pad 39A flame trench, inspectors test the repairs on the wall.
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![](../art/multimedia/missionprep/269370main_trenchrepair_full.jpg)
Repairs Completed! A view from above of the mended wall of the Launch Pad 39A flame trench
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