
conning tower, or whatever it actually was, that rose from the middle of the shaft resembled a conical stack of
variously sized plates, pierced through by several vertical pipes rising from the main body of the craft. The not
altogether agreeable image came to her of a tree stump smothered in bracket fungi.
Either the TARDIS or the alien craft must have been drifting, for, as Sam watched, the end of the massive hull
slowly turned towards them and she saw it was hollow. The interior was a tunnel large enough to drive a
supertanker through. But apparently it did not run the length of the craft, for there were no stars at the other
end, only a fathomless blackness.
The whole aspect of the craft was unfamiliar and deeply alien.
"That's funny,' Sam said. "The near end of that ship, or whatever it is, looks like it's out of focus...' She peered
closer and caught her breath. 'Doctor, do you know, I can see stars through the fuzzy half of it?'
'No, but if you'll sing it I'll hum along.' His expression became momentarily apologetic under Sam's withering
glare.'It appears to be translucent because part of the craft is extending into hyperspace,' he explained more
soberly. "That's the source of the discontinuity we detected.'
'Have you ever seen anything like it before?'
'No. But then even I am not familiar with every vessel ever put into space.'
'Isn't there some sort of data file you can check? Jane's All the Galaxy's Spaceships , sort of thing?'
"There is, and I consulted it while you were gawping at our find. Nothing like it is listed - but then not every
ship gets registered.'
Sam felt the great hulk looming intimidatingly at them. She took a deep breath and tried to sound offhand:
"Then I guess we'll just have to check it out for ourselves.'
'Unfortunately, that might not be possible,' the Doctor said, frowning at the console displays. "The craft's
emanating an unstable and very powerful energy field in real space as well as the higher dimensions. It
means I can't materialise the TARDIS much closer to it than this. However, as you may have noticed, we're
moving towards it at a steadily increasing velocity.The craft must have considerable mass to influence us at
this distance.'
'Will we hit it?' Sam asked, her voice betraying nothing of the alarm she felt.
'Fortunately no. Due to the interference we materialised with some intrinsic motion.That, combined with the
attraction of the alien ship, has put us on a hyperbolic trajectory.We'll make our closest approach in half an
hour or so, then pull away again.'
'Well, have you got any spacesuits with flight packs on board? We could buzz over and take a closer look
while we pass it.'
'Possibly... somewhere,' the Doctor said absently, running his lean quick fingers over the controls like some
maestro pianist.'But I'd like to filter out some of this interference first. It might affect the flight pack circuitry at
close range, and it wouldn't do to get ourselves marooned over there, would it?'
As he worked, Sam idly tracked the monitor image about, examining the alien craft curiously. What was its
purpose? That huge central shaft couldn't possibly be a drive tube, could it? Perhaps the whole thing was
some sort of spacegoing dry dock.
Then a twinkle of light beyond the edge of the craft caught her eye. The image on the monitor shrank as she
zoomed the camera out to encompass a wider angle of space. Two other ships appeared, standing off on
opposite sides of the alien vessel. And even on this long view she could see internal lights sparkling on them.
'Doctor, we've got company.'
The Doctor looked up, his eyes narrowing.'So we have. Apparently somebody else detected the same energy