Question 2778 Deck General

The correct answer is D) moon pool. A moon pool is a walled opening below the derrick of a drill ship or barge that is open to the water's surface. This allows various drilling tools and equipment to be lowered through the moon pool down to the sea floor. This is a common and necessary feature of offshore drilling vessels to facilitate their operations. The other answer choices are incorrect. A pontoon is a floating platform, not a specific feature of a drill ship. A keyway is a slot or groove, not related to the drilling equipment access. A spider deck is a different part of the drilling rig, not the opening below the derrick.