On 1st November, 2019 @around 22:00 hours, after lowering the mast crew was securing the stand pipe vibrator hose. Floor-men secured the first hose but while securing the second hose hammer union caught on substructure beam. Floor-man freed the hammer union by standing on the substructure beam and unlatched the lanyard to come out on rig floor. While coming out floor-man slipped and fell down to ground (Height: 3.4 meter). Floor-man evacuated to rig clinic where medic administrated first aid and transferred him by rig ambulance to Nizwa hospital for further treatment.