Bob Lazaar saw the spacecraft and described a 'gravitaional' drive system that beats the faster-than-light travel problem. Mathematically it is correct, and if we could only reverse engineer it we could be traveling to the stars ourselves soon.
I really believe this- I am not joking!
I think we just have not figured out the technology to bend space so as to travel far away instantaneously...
I have grave doubts about the claims made by Bob Lazaar.