Ariane 6 mobile gantry

Europe's Spaceport in Kourou, French Guiana is preparing for Ariane 6. 

This 90 metre-high metallic structure is the mobile gantry; it weighs 8200 tonnes – more than a thousand tonnes heavier than France's Eiffel Tower. It has been moved along its rails from the retracted position to over the launch pad. In this position its platforms provide engineers access to the launch vehicle for integration on the launch pad.

Ariane 6 is fully protected until the mobile gantry is retracted about five hours before launch.