India’s first ballistic missile submarine was out of commission for ten months after someone neglected to properly close a hatch. The nuclear-powered submarine INS Arihant was flooded with saltwater, necessitating nearly a year’s worth of repairs. The submarine is designed to function as a floating arsenal of nuclear weapons, guaranteeing a retaliatory strike in case of surprise attack.

The incident was first reported by The Hindu. According to an Indian Navy source, a hatch was left open on the rear left side of the ship, allowing seawater to rush into the propulsion area while the Arihant was in harbor. Arihant was out of action for ten months as water was pumped out and pipes were cut out and replaced. Indian authorities likely felt that pipes exposed to corrosive seawater couldn't be trusted again, particularly pipes that carry pressurized water coolant to and from the ship’s 83 megawatt nuclear reactor. Failing pipes could not only endanger the ship’s crew but the entire submarine... and her nuclear weapons.