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With reference to cargo hatch covers on large container ships:

(a) describe how they are tested for weathertightness; (2)

(b) explain how the weight of the hatch and containers is transferred to the ship's structure whilst allowing for deflections of the hull in a seaway;(3)

(c) describe, with the aid of a sketch, the type and location of damage that can occur due to wear of the hatch supporting arrangements. (5)