"Uncontrollable" speed is a key factor behind a dramatic incident last week involving an Ocean Network Express (ONE) ultra-large containership at Busan in South Korea.

Th incident caused the ship to destroy a gantry crane, make contact with five others and strike another ship, according to the operator.

Japan's ONE confirmed that the 13,870-teu Milano Bridge (built 2018) hit multiple shore gantries and a moored containership while approaching Pusan Newport Co's No8 berth last week.