Here's a subject that will spark great debate. Please try a little research before you post so this can be a "educated discussion".
A hint! The answer is available to those who seek.

The night Titanic sank not all of her watertight bulkheads were closed. And anyway, most of the watertight bulkheads only went up as far as E Deck. Which is unreasonable.

I'm not sure, but weren't some of the watertight doors reopened to feed hoses through to aid in pumping?

no. i don't think they were. does anyone know how many were closed?

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I looked around and couldn't find anything to support this...

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Hello,

Try looking through the British investigation transcripts and report.

Best wishes,

Mark.

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Hello,

In many ways, it could be said that this was a criticism that only came to prominence in hindsight. Certainly it's undeniable that the watertight subdivision could have been improved, yet there are some aspects of the design that are often overlooked. For instance, the watertight bulkhead stiffeners were placed slightly closer together than Lloyd's requirements, while the plating of the various watertight bulkheads was from 10 to 20 percent thicker than requirements; Edward Wilding belived that the strength of the stiffening of the watertight bulkheads was 50 percent in excess of Lloyd's requirements.

Meanwhile, with regard to the number of main transverse bulkheads required, it was believed that had the Lloyd's requirements been updated for a ship as large as Titanic, then they would have required only thirteen bulkheads instead of the fifteen Titanic had. If we look at the 900-foot Imperator, completed in 1913, she only had twelve main transverse bulkheads -- although her arrangements were more favourable in other respects.

Best wishes,

Mark.

I kinda think there'd been watertight doors open further aft during the course of the sinking.

uhh...helloo? how many doors were closed?

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OK here is the answer:
Read the transcripts of these two witnesses taken back in 1912 by two of the last men to leave the bunker areas during the investigation of the Titanic sinking. Note when the witness explains how they were ordered to reopen the watertight doors, which ones where left open when the last man left and pay special attention HOW THE WATER ADVANCED through the levels. The height of the bulk heads are total errelavant as the water never had to flood over the top at E-deck it mearing moved in a laterail direction through open doors!

http://www.titanicinquiry.org/BOTInq/BOTInq05Cavell01.html

http://www.titanicinquiry.org/BOTInq/BOTInq05Dillon01.html