Neal, you may wish to read
The Last Log of the Titanic by David G. Brown and
The White Paper on the Grounding of Titanic by David G. Brown and Parks Stephenson for some current theories on what most likely happened to the ship,
vis a vis an allision/grounding event with the iceberg
You may also wish to read Roy Mengot's
The Wreck of RMS Titanic website for more in the way of current technical information.
A little spoiler, the Titanic never had a gash.
This much has been confirmed by the sidescan sonar imaging that was done several years ago which found popped rivets and split seams. Unfortunately, there is no way to tell if which was the result of the entanglement with the berg or the approximately 22 knot impact with the bottom, but still, what they didn't find was a gash.
Interestingly enough, this was also understood...at least by the BOT inquiry...in 1912, which states;
The collision with the iceberg, which took place at 11.40 p.m., caused damage to the bottom of the starboard side of the vessel at about 10 feet above the level the keel, but there was no damage above this height. There was damage in: - The forepeak, No. 1 hold, No. 2 hold, No. 3 hold, No. 6 boiler room, No. 5 boiler room.
The damage extended over a length of about 300 ft.
Nowhere does it say anything about a gash. The contemporary news media was where that one started and it has since taken on a life of it's own.
You may wish further to read Edward Wilding's testimony which was taken over four sessions and can be read here:
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BOT › Day 18
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BOT › Day 19
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BOT › Day 20
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BOT › Day 27
It's rather involved, but well worthwhile.