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I must admit I tend to be rather cynical of documentaries, sometimes they seem to go for the more dramatic.

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You would really need an enormous difference in stresses for one part of the bulkhead to fail. They were expressly designed to hold back a considerable head of water, and the strength of their construction is often overlooked. It's not so much a question of collapse, more a question of losing its watertight integrity. Edward Wilding explained it very well in testimony during 1912 and 1915.

Best wishes,

Mark.