An event or sequence of events that has occurred directly by or in connection with the operation of a ship but which does not qualify as a very serious marine casualty, that involves:
(i) fire; (ii) explosion; (iii) collision; (iv) grounding; (v) contact; (vi) heavy weather damage; (vii) ice damage, or a suspected hull defect; resulting in any of the following: (a) the immobilization of the main engines; (b) extensive accommodation damage; (c) severe structural damage including penetration of the hull under water rendering the ship unfit to proceed; (d) pollution; or (e) a breakdown that necessitates towage or shore assistance.
