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 creek cross gap go through helmets hole ponting river run through tarzaning torrent tree climbing animal attraction beast blankets bridle burden camel head Israel Jerusalem mammal pommel ride saddle tourism tourist