anchored climb climbing danger dangerous dangers grip gripping Harness height high hoisted hold holding immobilised immobilized lines maintenance maritime mast plank repairs rigger rigging risk risks risky rope ropes safety safety-equipment safety-harness sailing seat seated seaworthy secured securing security ship stop stopped suspend suspended tall-ship tough transport vessel work workman arboriculturist arborist ascended Australia balancing belt chainsaw climber cutting descending ear-muffs expertise helmet lop lopping man-at-work noise-reduction Noisy professional removal remove removed safety-glasses sawing suspension tall-tree tree tree-lopper tree-lopping tree-management tree-surgeon trees up-high chain-saw cover covered covering ear-protection equipment feeding grinder helmeted helmets high-pressure improvement machine machinery men-at-work outdoor-power-equipment power-equipment protection protective-clothing protective-gear pushing safety-colours spray stumpgrinder sunlight sunshine tools tree-branches tree-loppers wood-chipper wood-chipping wood-chipping-machine work-clothes workers workmen branches chipper chipping chipping-machine chips