Question 4418 Deck General

The correct answer is C) capsizing. Buoyancy associated with empty or partly empty ballast tanks in the mat (bottom foundation) of a mat-supported jack-up Mobile Offshore Drilling Unit (MODU) during jacking operations can cause the MODU to become unstable and potentially capsize. As the ballast tanks are emptied, the buoyancy of the mat decreases, which can shift the overall center of gravity and lead to a loss of stability, resulting in capsizing. The other options are incorrect because progressive flooding, negative buoyancy, and delays are not the primary risks associated with this scenario.