Could an improvised barrier have been rigged up on Titanic's E deck to slow the flooding?

[William Oakes]

Yeah Titanic only had the ships Designer, White Stars most experienced Captain, 2 crew Carpenters another in the guarantee squad, a dozen more in the passenger list, a Carpenters shop, Carpenters store and tonnes of surrounding timber in the form of tables, doors, and furniture surrounding them, and only 1 hour until the critical juncture. Neither had a ship ever been holed and saved before, whereas manned spacecraft 200,000 miles away, without any chance of rescue, were blowing up all the time. No comparison!

More seriously, the real difference was the positive rather than defeatist attitude. There was one similarity, it was damn cold!

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Okay Peter, then if they could have, then why didn't they?
I don't think that you can chalk it up to a defeatist attitude.
That is over simplifying it.
Most of the people you mention had plenty to live for.
I don't see a scenario where all of them threw up their hands and collectively said, "Oh what the hell, we're going to die so why try!"
So if what you are postulating is easily done, then why didn't they do it????
I'll wait for your answer.