The DEEP DRILLER departs a fresh water port at a draft of 19.5 feet. What will be the draft in sea water?

Correct Answer: Option B — 19.1 feet

Fresh water density is 1.000 while sea water is 1.025. Applying the draft change formula using displacement and TPC (tons per inch immersion) or density ratios, moving from fresh to salt water decreases the draft by approximately 0.4 feet, resulting in 19.1 feet per stability manuals.