🔍 Key Concepts

• Double bottom structure in ship construction • Difference between inner bottom, outer bottom, and tank top • How spaces are used for ballast, fuel, or protection against grounding

💭 Think About

• Which parts of the hull actually create an enclosed space rather than just a single plate or surface? • In normal ship construction, where is the double bottom located relative to the keel and the tank top? • Which option describes not just a plate, but a volume that can be used as a tank or protective void?

✅ Before You Answer

• Identify which choices describe plates/surfaces only versus an actual enclosed space/compartment • Recall that the inner bottom is above the shell plating at the bottom of the ship—what space does that create? • Ask: which option best matches the idea of a protective, usually watertight volume used for ballast or fuel at the very bottom of the ship?