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When joining a ship for the first time, it is very important to become familiar with its particulars, safety equipment, design features and their locations. One design feature fitted to many types of vessels is the use of powered watertight doors to protect the ship from the risk of flooding in case of the grounding, collision or structural damage. When closed, these doors become part of the ship's structure acting as a barrier for the flood water, and their strength is vital - they are built from the heavy steel requiring them to be moved by hydraulics or powered by electric motors... This training will be perfect if watched with this booklet on same topic.