The tank had what we’d come to call legs, six-foot-long telescoping rods of metal which could be extended by springs and retracted again by solenoids. I was still hoping not to have to use magnets, but it seemed that the legs were in order; I propped out four of them in what I hoped were reasonable directions. Enough of the guesses were right to stop the rolling, and for the first time I had a steady observing platform. Naturally, I concentrated on the area I could see.

I was now below the level of the lights themselves. They appeared to be strung on lines at intervals of about twenty yards, with the same spacing between lines. That was a guess, though, since I couldn’t actually see any supports. Their regularity bolstered the guess, though the fact that the wreck had come down just about on a line between two of the lights without appearing to disturb them counted rather against it. I wasn’t too surprised to see nothing growing or moving on the flat surface they illuminated, though of course I wouldn’t have been surprised to see a few tracks or holes scattered around.

At least, I wouldn’t have been surprised at them if I’d not seen the Pugnose’s landing. With that to go by, it was perfectly clear that whatever I was looking at was not sea bottom. It was more like a rubber sheet stretched like a tent roof over everything more than about ten feet down slope from me. The wreck had dented it but hadn’t punctured it, and the stuff was strong enough to hold up the comparatively small submerged weight of metal and plastic.

This, I reflected, could be useful. I had no idea why whoever was under the tent wanted to light up the outside, but unless the fabric were completely opaque they could hardly help seeing the shadow and the dent in their ceiling. That should bring people to investigate, and they would be easy to see without my having to use lights of my own and giving myself away.