Two drilling rig workers had completed the installation of a valve and flowline to the diverter assembly under the rig floor. The workers were in the process of retrieving additional tools and lanyards that were required for the job which was to take the tugger off flowline and remove lanyards from substructure area. To access the lanyards one of the workers climbed under the flowline. He was not secured to the ladder fall arrest system while climbing and working at this position. He then reached for the lanyards and while in the process of tossing them to the rotary platform he lost his balance. He fell approximately 7 meters (23 feet) to the matting. Fortunately, he sustained only minor injuries.
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