🔍 Key Concepts

• Center of gravity (G) movement when weight is lost or gained high/low or forward/aft • How ballast transfer into one specific tank affects list (port/starboard) and trim (fore/aft) • Effect of mooring line failure on a column-stabilized unit’s heading and offset versus its internal trim/list

💭 Think About

• Look at where the inclination is: starboard and aft. For each choice, ask: would that event move the vessel’s center of gravity or buoyancy in a way that produces that exact combination of list and trim? • Consider which options cause an internal weight shift versus an external positional change. Which one actually changes the vessel’s heel/trim rather than just its location? • Think about where the relevant weights are physically located on the DEEP DRILLER (drill string, mud, ballast tanks) and whether losing or gaining those weights would make the vessel go down by the stern or bow, and to port or starboard.

✅ Before You Answer

• Verify which side (port or starboard) tank 10S is on and whether filling it would push that side down or up. • For the drill string and mud, check whether losing that weight is high or low, and whether it is roughly on centerline or off to one side, and how that would affect list and trim. • For mooring line failure, confirm whether this typically causes a change in heading/position relative to the well, or a sudden internal heel/trim, especially in light wind and waves.