"There are still questions, basic questions, that need to be answered about the ship... We really don't understand the character of the collision with the iceberg. We don't even know if she hit it along the starboard side, as is shown in all the movies - she might have grounded on the iceberg," said Parks Stephenson, a Titanic analyst.
"The depth of it, almost 4,000m, represents a challenge, and you have currents at the site, too - and we're not allowed to touch anything so as not to damage the wreck," said Gerhard Seiffert from Magellan, who led the planning for the expedition. "And the other challenge is that you have to map every square centimetre - even uninteresting parts, like on the debris field you have to map mud, but you need this to fill in between all these interesting objects."