CNN New Day April 15, 2014 11:45:00
Vehicle. >> this is the gap that is not record sgloug need to fill that gap up because sometimes what you're looking for may be in the gap. sometimes they overlap the tracks. >> is that also why they have to have it not right on the surface, that it has to be sort of hovering above? >> partly right. the closer you get you can close the gap more but then you start to lose the edges. you want to find -- decide what am i looking for and make it optimal for that. >> there are ways to t account for that gap. >> yes. >> moving on to this. you were involved in the titanic expedition and this is an im...