What are the two types of dry dock used to take hulls out of the water?

The correct choice identifies the two types of dry dock as Floating and Graving. A Floating dry dock is a large structure that can be submerged, allowing a vessel to enter it. Once the dock is floated with the vessel inside, it is then raised to take the hull out of the water. This type of dock is advantageous for vessels that may need to be serviced in different locations or for those that cannot be drydocked at a fixed location.

Graving docks, on the other hand, are constructed on land and are typically excavated into the ground. Vessels are floated into the graving dock, and then the water is pumped out, leaving the hull exposed for maintenance or inspection. This method is commonly used for larger vessels or in shipyards that carry out extensive repairs, as they provide stable support for ships during dry docking.

The other options do not accurately define the recognized types of dry dock. While terms like "fixed" and "movable" refer to aspects of structure and positioning, they do not specifically categorize the types of dry docks as commonly used in maritime practices. Likewise, "open" and "closed" miss the technical definitions in favor of broader terminology. Understanding the specific classifications allows professionals in the maritime industry to select