I've been fascinated by this story for a while, since I read about it sometime last year. I've seen those artist's impression paintings on the official website of the guys who go down there (So they are impressions based on the genuine data). I somehow doubt it's a crashed UFO, but you never know. There are so many things it could be. I'm sure they'll eventually decide it's a natural phenomenon of some kind, but it I suspect there will never be a definitive answer. Perhaps a relic of an early civilisation? It'd be great if it turned out to be evidence that humans had been technologically advanced a lot longer than archaeologists thought possible.
As for the 'landing strip' it could be as simple as a it being an area left clear when debris has collected and settled coming from the opposite side of the structure.
The difference between this and the titanic, is that the Titanic has been an obsession of individuals and the public for decades. This is a recent discovery that most will brush off as nothing. So nobody's going to spend money going down there, except for the guys who discovered it and know there's something definitely worth investigating, even if it's only for their own profit.