To maintain a high state of readiness against the possibility of damage and subsequent flooding while aboard the DEEP DRILLER, you should __________.

Correct Answer: Option A — cap sounding tubes except when in use

Sounding tubes serve as direct pathways to the bilges and tanks. Capping them securely when not actively in use is a mandatory watertight integrity practice outlined in 46 CFR to prevent progressive downflooding in rough seas or unexpected hull damage incidents.