Captain Jamie Frederick of the US Coast Guard said during a press conference the area of the search has been expanded - the surface search is now twice the size of Connecticut, and the sub-surface search is approximately 2.5 miles deep.
He said officials and rescuers are having to factor in sea changes and currents.
"There is an enormous complexity of it being so far offshore," he added.
The US Coast Guard currently have five surface vesels searching for the Titan and they expect there to be 10 in the next 24 hours.
There are two Robotically Operated Vehicle (ROV) and there should be additional ROVs joining the search.
Captain Jamie Frederick said that yesterday the Canadian P-3 detected underwater noises in the search area.
“As a result ROV operations were relocated in an attempted to explore the origin of the noises. Although the ROV searches have yielded negative results they continue."
He added that the data from the P-3 aircraft has been shared with US Navy experts for further analysis "which will be considered in future search plans".
He admitted that they don't know what it is and that is why they have put so many sonobuoys in the area.
Capt Frederick hopes more ROVs will arrive in the morning as they continue to search the area where the noise was detected.
Some of those extra ROVs have extra depth capability, he tells reporters.
Capt Frederick said the aircraft crew that saw an object yesterday determined it not to be part of the case. He said it is not uncommon to spot various objects in the ocean that are not part of a search.
He said the tourists and crew on the craft have limited rations aboard but I could not tell exactly how much.
Capt Frederick said it is his understanding the Canadian P-3 aircraft heard some noises today as well.
He introduced Carl Hartsfield for his expertise in this area.
Hartsfield told reporters it is very tough to discern what the noises are.
His team has "multiple sensors in the area taking the data back to the best people in the world and feeding this back to the team so they can make decisions".
"They have to eliminate potential manmade sources other than the Titan," he added.
Capt Frederick expressed optimism as the search continues.
"We have to remain optimistic and hopeful when we are in a search and rescue case," he said in response to a question.
"We are in the middle of the search and rescue case. Sometimes we don't find what we're looking for and you have to carefully consider all of the factors.
"There are a lot of factors you have to consider. After considering all those factors, sometimes you're in a position where you have to make a tough decision. We're not there yet.
"If we continue to search, potentially we could be at that point... And that's a discussion we will have with the families long before I am going to discuss here publicly."