40 At [84]-[85] of the appeal judgment, McClellan CJ at CL was also of the view that causation presented what his Honour described as "an insurmountable difficulty" for the Crown at trial. If that observation applies equally to an objective assessment of the evidence available to the Crown at the time the proceedings were instituted, as contended for by the applicant, then the application for costs is well founded.
41 In order for the Crown to make good its case against the applicant it was not enough, as a matter of law, that the deaths were causally linked to the failure to provide or implement proper supervision and quality control. It was necessary for the Crown to establish to the criminal standard that the applicant's omissions (as alleged) caused the death of those on board the yacht by "significantly contributing" to the failure of the keel. Because the cutting and welding of the keel was an unauthorised deviation from the architect's plans and, as this Court found, executed without the applicant's knowledge (in fact contrary to his express instructions), and because the cut and weld was not detectible by visual inspection, McClellan CJ at CL concluded that once QA and ITPs are put to one side it was not open to the jury to find that a system of supervision which was capable of identifying an unauthorised event of the kind that occurred in this case should have been in place.
42 The Crown emphasised that his Honour's conclusion on the issue of causation hinged upon the direction the trial judge gave the jury to disregard the QA and ITPs. This much is clear from his Honour's reasoning in [85]. When the proceedings were instituted, however, the Crown submitted that it had available to it evidence from a variety of sources additional to the evidence the trial judge directed the jury to disregard. This included the applicant's evidence at the inquest that there were measures available to be implemented as part of a system of quality control (including the dye penetration test and pre-testing the skill and proficiency of the welders) which, if implemented, was said to be capable of persuading a jury that the cutting of the keel, and importantly, so far as the reason for its failure is concerned, the defective welding of the keel, would not have been done and, if done, would have been detected before the keel was attached to the yacht. Although the evidence established that there was no general practice, much less a requirement, in the yacht building industry for welds to be pre-tested, the Crown tendered evidence in the form of a statement from Mr Brown, an experienced boat builder, that he tested his welders before they were engaged in the construction of a yacht. The Crown submitted that this was evidence a jury was entitled to have regard to when considering what a reasonable person in the applicant's position would have done, and whether the applicant's failure to pre-test his employees should attract criminal sanction, and that it was reasonable for the Crown to rely upon this evidence when instituting the proceedings. I have already referred to the Crown's submission on the availability of the weld penetration test and its bearing on the issue of causation.
43 In the result, the Crown submitted that on an objective analysis of all relevant facts when the proceedings were instituted, it was reasonable for the Crown to hold to the view that a jury could have been satisfied that the applicant's failure to provide an adequate system of work caused the death of the four sailors by contributing significantly to the failure of the keel. The fact that the weight of the evidence of the need for and practice of pre-testing welders was diminished as the trial progressed, and that the availability of the dye penetration test was not adduced at the trial at all, is, as the Crown emphasised, not determinative of the question posed by the application under the CCC Act, namely whether the applicant has made good its submission that proof of causation on the alternate basis upon which the Crown put its case was so problematic that it was not reasonable for the proceedings to be instituted.