ST_BIG_UFO_DESTROYER,        ///< Aircraft the will bomb the big UFO

	ST_BIG_UFO_DESTROYER_SHADOW, ///< Shadow of the aircraft.

	ST_SMALL_SUBMARINE,          ///< Small submarine, pops up in the oceans but doesn't do anything

	ST_BIG_SUBMARINE,            ///< Big submarine, pops up in the oceans but doesn't do anything

};

/**

 * Disasters, like submarines, skyrangers and their shadows, belong to this class.

 */

struct DisasterVehicle FINAL : public SpecializedVehicle<DisasterVehicle, VEH_DISASTER> {

	SpriteID image_override;            ///< Override for the default disaster vehicle sprite.

	VehicleID big_ufo_destroyer_target; ///< The big UFO that this destroyer is supposed to bomb.

	/** For use by saveload. */

	DisasterVehicle() : SpecializedVehicleBase() {}

	DisasterVehicle(int x, int y, Direction direction, DisasterSubType subtype, VehicleID big_ufo_destroyer_target = VEH_INVALID);

	/** We want to 'destruct' the right class. */

	virtual ~DisasterVehicle() {}

	void UpdatePosition(int x, int y, int z);

	void UpdateDeltaXY(Direction direction);

	void UpdateImage();

	bool Tick();

};