a sudden and catastrophic structural failure. It may be pointed out that the bridge was at one of its critical stages at the time of the accident. […] 8.2.2.2 […] At this stage, as noted in para 5.8, the stabilizing moment would become less than the overturning moment. Uncontrolled rotation of the pylon about the base would take place which 5would result in its gaining momentum as it fell. This is borne out by the fact that the catastrophic failure involved a catapult action wherein the span P3-P4 as a whole, (which was tied together by prestressing cables) was thrown some 100 m away. 8.2.2.3 The serious distress in span P3-P4 referred to para 8.2.2.2 could have been caused by shortfall in design, poor workmanship, unexpected load, sub-standard material or distress in foundation P4 or a combination of some of these. […] 8.2.2.4 It can be seen that had there been additional stability devices in place (such as those mentioned in para 8.2.2.1) the cycle involving progressive loss of