Latent defect
64 Historically, latent defect was an exception to the implied warranty of seaworthiness and related to defects in the hull of the vessel or its tackle or machinery whereas, according to Carver on Carriage By Sea, 13th edn at 382 [541], paragraphs (m), (n) and (o) of Article IV r 2 "apparently refer to inherent defect or vice and insufficiency of packing or marks of the goods." A footnote to the same passage in that work suggests; "But para (p) may include latent defects in other cargo or in shore tackle." As I understand it, the container into which the goods were packed was made available by the defendant and was at all times from reception at the terminal in Yokohama until its discharge from the P&O Ports terminal in Melbourne under the control of the defendant or its agents. I have therefore proceeded on the basis that the exception in par (p) is available to the defendant if the loss to the goods arose or resulted from a latent defect in the container, being one that could not have been discovered using reasonable methods by a person of competent skill using ordinary care; see Minister of Materials v Wold SS Co [1952] 1 Lloyds Rep. 485.
65 I am satisfied on the balance of probabilities that the damage to the goods in the present case arose or resulted principally from the container's having been stuck in defrost mode for an extended period between 27 and 29 November 2005. It is likely that the propensity of the container to become stuck in that way was due to the incompatibility between the container's controller and the software with which it was fitted. However, as already indicated, it was not that propensity which was the immediate cause of the plaintiff's loss but the continuous running of the container in defrost mode for more than 77 hours. That was an event which could have been detected and rectified had the defendant's employees and agents carried out an appropriate monitoring and inspection of the container and made proper records, including notations of any apparent anomalies which might require further investigation or rectification. It was the departure of the master and crew of the ship from accepted good practice in those respects which, I consider, amounted to a failure to exercise due diligence properly and carefully to carry, keep and care for the goods in the defendant's container. I shall indicate briefly my reasons for reaching that conclusion.
66 I find it more likely than not that either or both "defrost" and "heater" lights were illuminated on the container's display panel for at least part of the extended time during which the container was in continuous defrost mode. I have not overlooked Mr Andersson's opinion noted at [32] above that it could not be known what lights on the display panel were on and off while the unit was malfunctioning. However, I prefer the inference from relevant available evidence that, for at least part of the time while the unit was stuck in defrost, lights or other alarms were visible which should have alerted a reasonably diligent crew member to that fact or put him or her on enquiry whether the unit was excessively defrosting.
67 There is no direct evidence of what the temperature display module on the container showed after the unit became stuck in display mode. The expert witnesses, Mr Brown, Mr Southcombe and Mr Andersson differed in the inferences on this issue which they preferred to draw from the known facts which appeared to point in different directions. After some hesitation, Mr Andersson was inclined to the view that the temperature display simultaneously became stuck or frozen when the unit became stuck in defrost mode. However, he was unable to commit himself to whether the presumptively frozen temperature display showed a temperature in degrees expressed as a whole number or to one or more decimal points. Mr Brown believed that, from the time the unit became stuck in defrost mode, the temperature display was also stuck on a single temperature but did not express a view as to whether that would have been displayed as a whole number or to one or more decimal points. His opinion was that whatever temperature on which the display module was stuck would have been within the range from -20ºC to +1.4ºC. Mr Southcombe's views on this issue were similar to those of Mr Brown.
68 I am disposed to accept on the preponderance of expert opinion, that the temperature shown on the display module remained constant from the time when the container became stuck in defrost mode at 1810 hours on 26 November 2005 until it ceased malfunctioning at 2356 hours on 29 November 2005. That means that the temperatures recorded in the Reefer Log for that period, whether they represented a calculated average, or purported to be a transcription of an actual entry made by a crew member, could not have been derived from actual ocular observation of the display. At best for the responsible crew member or members involved, they were entered recklessly without caring whether they had any basis in fact. Moreover, if the temperature shown by the display had been constant throughout the period during which the unit was stuck in defrost, that would have been so markedly in contrast to the variable temperatures observed during normal operation that it should have alerted the relevant crew member or members to the likelihood of a malfunction.
69 I make a similar finding in respect of the defrost light which, I believe, on the basis of the evidence of Mr Brown and Mr Southcombe, was probably showing on the unit's display panel for the whole of the time during which the unit was stuck in defrost mode. That abnormality should have alerted the crew member who saw it, or the electrician mentioned in Captain Bellotti's email of 5 April 2007 quoted at [61] above to the fact that heat was continuously being applied to the container. That should have prompted a properly trained and responsible crew member to rectify the problem.
70 It is more probable than not that while the unit was stuck in defrost mode, the condenser fan was not running and so would not have been audible to a crew member monitoring the container. I accept the existence of the "possibility" to which Mr Andersson adverted in the portion of his evidence summarised at [27] above: ie, that the condenser fan motor could have been activated and continued to run audibly while the unit was stuck in defrost. However, I regard that hypothesis as less likely than that the condenser fan behaved normally and did not run during defrost, even one prolonged for over 77 hours as a result of an incompatibility between the controller and the software version then used on it. The corollary to the proposition accepted by Mr Andersson as described at [33] above, is that a crew member failing, on several successive visits to the container, to hear the condenser fan running, should have done something about it.
71 I do not accept that the various "abnormalities" which Mr Andersson discerned from the sensor log or the event log of the container during the pre-voyage period in October 2005 and later while the container was concededly functioning normally, support his primary thesis that while the unit was stuck in defrost mode, no alarm, light or temperature reading was visible to alert a crew member to that fact. There is a marked difference of opinion between Mr Andersson on the one hand and Mr Brown and Mr Southcombe as to whether all or any of the matters identified by Mr Andersson were "abnormalities" at all. It is unnecessary for me to resolve this controversy because, even if all the matters in Mr Andersson's catalogue had been attributable to the incompatibility between the container's controller and its software, it is improbable that the fact of the unit's being stuck in defrost mode would have been undetectable by the electrician or some other crew member.
72 Another matter which negatives proper and careful keeping and monitoring of the container during the voyage and the exercise of "due diligence in the sense used in Article IV r 2(p), is the fact that a pre-trip inspection was apparently initiated at 2353 hours on 29 November as disclosed by the event log and noted at [13] of these reasons. I accept it as more probable than not that the initiation of that pre-test inspection was by the human intervention of a crew member using a keypad as Mr Brown suggested. That conclusion is consistent with Captain Bellotti's speculation.
73 It also receives support from an internal email of 3 April 2007 by Mr Alfred Zhang, the claims manger for China Shipping who was then seeking information about the steps which had been taken during the voyage in November 2005 to rectify the defect to which the container was then subject. Mr Zhang wrote;
CSCL [China Shipping] must prove that it exercised due diligence in caring for the goods. As attached the Automatically generated Event Log for the container evidences that on 29 November 2005 (whilst the container was on board the vessel) someone manually accessed the reefer's keypad and "Initiated by Keypad" an "Auto PreTrip" of the container which was then "Power[ed] down" and then "Power[ed] up."