I’ve not heard anything about it being related to the timing of the bulkhead closures, but rather the fact that they tried to avoid the iceberg and scraped along the side. If they had’ve just thrown the engines in reverse to slow down as much as possible and ram it head-on, they would have only broken one or two chambers. But they ended up an opening like 5 chambers when it was only designed to handle 4 chambers flooding.
No seaman in his right mind is going to intentionally ram anything, it’s always going to be the better call to try and avoid it. This argument also ignores the flexing of the hull that happens on such an impact. A good example of this is Titanic’s sister ship the Britannic, which hit a mine during World War I and sunk in the Mediterranean. The impact from the explosion warped the hull and prevented the watertight doors from closing.
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