We don't know, first because it isn't certain which iceberg was the culprit, and secondly, no-one was rowing out to take measurements. And most of it was under the sea surface, anyway.
It did not need to be very big, however. The damaged was caused by the Titanic's last-moment effort to swerve around it, which nearly succeeded and which already is an indication that the iceberg wasn't exactly a mile in diameter. And then the damage was caused by the scraping of the underwater part of the ice alongside the ship's hull, not by its sheer mass. Experts later have voiced the opinion that if the iceberg had not been seen at all and been hit with the ship's bow, the damage (although heavy, and probably causing many broken bones amongs passengers and crew) would have been limited to a small area and the ship might have remained afloat.
The Titanic sank because of an iceberg.
the titanic was sunk by an iceberg the titanic was sunk by an iceberg
The RMS Titanic hit an iceberg
There was no regice on the iceberg Titanic hit.
Titanic hit the iceberg on a Sunday evening.
The Titanic sank because of an iceberg.
the titanic was sunk by an iceberg the titanic was sunk by an iceberg
The RMS Titanic hit an iceberg
Yes. Titanic hit an iceberg.
There was no regice on the iceberg Titanic hit.
Most definitely without a doubt, Titanic struck the stationary iceberg at about 25 mph.
Titanic hit the iceberg on a Sunday evening.
it crashed into an iceberg and the ship sank
Titanic's collision with the iceberg was about 400 miles south of Newfoundland.
By far, the iceberg was much, much larger than Titanic. The upper 10% that was out of the water alone was almost up to the promenade deck and we don't even know how wide it was.
No. The Titanic is much much much bigger than any possible squid could be. The Titanic sank because it hit an iceberg.
No. An iceberg sank the Titanic. The Germans sank the Lusitania.