The Korean Register of Shipping examined the Sewol early last year as it was being redesigned to handle more passengers. The register slashed the ship's cargo capacity by more than half, to 987 tons, and said the vessel needed to carry more than 2,000 tons of water to stay balanced. But the register gave its report only to the ship owner, Chonghaejin Marine Co. Ltd. Neither the coast guard nor the Korean Shipping Association, which regulates and oversees departures and arrivals of domestic passenger ships, appears to have had any knowledge of the new limit before the disaster.
"That's a blind spot in the law," said Lee Kyu-Yeul, professor emeritus at Seoul National University's Department of Naval Architecture and Ocean Engineering.
Chonghaejin reported much greater cargo capacity to the shipping association: 3,963 tons, according to a coast guard official in Incheon who had access to the documents but declined to release them.
Since the redesigned ferry began operating in March 2013, it made nearly 200 round trips 394 individual voyages from Incheon port near Seoul to the southern island of Jeju. On 246 of those voyages, the Sewol exceeded the 987-ton limit, according to documents from Incheon port.
The limit may have been exceeded even more frequently than that. In all but one of the other 148 trips, zero cargo was recorded. It is not mandatory for passenger ferries to report cargo to the port operator, which gathers the information to compile statistics but not for safety purposes.
More than 2,000 tons of cargo was reported on 136 of the Sewol's trips, and it topped 3,000 tons 12 times. But the records indicate it never carried as much as it did on its final disastrous voyage; Moon Ki-han, a vice president at Union Transport Co, the company that loaded the ship, has said it was carrying an estimated 3,608 tons of cargo.
The port operator has no record of the cargo from the Sewol's last voyage. Ferry operators submit that information only after trips are completed. In that respect, the rules for domestic passenger ships are looser than those for cargo-only vessels, which must report cargo before they depart.
Details from the port documents were first reported by the South Korean newspaper Kukmin Daily.
In paperwork filed before the Sewol's last voyage, Capt. Lee Joon-seok reported a much smaller final load than the one Moon described, according to a coast guard official who had access to the report but refused to provide a copy to the Associated Press. The paperwork said the Sewol was loaded with 150 cars and 657 tons of cargo.
That would fall within the 987-ton limit, but it's clearly inaccurate: The coast guard has so far found 180 cars in the water.
An official with the Korea Shipping Association's safety team said it is beyond the association's capacity to determine whether a ship is carrying too much cargo. He spoke on condition of anonymity.