🔍 Key Concepts

• MODU (Mobile Offshore Drilling Unit) hull form and how it behaves underwater • What makes working physically on the hull difficult besides just getting to it • Effects that increase with water depth around the hull

💭 Think About

• Ask yourself: once a diver or ROV reaches the damaged area, what natural force still makes the repair hard to perform or to hold in place? • Which option would apply to any underwater repair on a deep‑draft structure, not just to one particular design or equipment setup? • Think about what changes as you go deeper in the water around the MODU, and how that affects people, tools, and patching materials.

✅ Before You Answer

• Focus on factors that are inherent to the underwater environment, not human logistics like tools or crew. • Eliminate choices that are more about ship design details or emergency consequences rather than day‑to‑day repair difficulty. • Ask: which factor is directly tied to depth below the surface, and would challenge divers even if access and tools were already ideal?