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A derrick pole on board a boat hoists a lifeboat on and off the ship in open water. A winch attached to the rigid vertical member carries the cable allowing for hoisting of the lifeboat. The vertical member allows for rotation of the derrick pole i.e. to swivel between the deck and water (Figure 1). The derrick has a safe working load of 1 ton. During a hoisting operation, the derrick pole failed catastrophically, releasing its load.
