Already Jackstraw had plugged our searchlight into the dry battery and handed me the lamp. I pressed the switch, and it worked: a narrow but powerful beam good for six hundred yards in normal conditions. I swung the beam to my right, then brought it slowly forward.

Whatever colours the plane may have had originally, it was impossible to distinguish any of them now. The entire fuselage was already shrouded in a sheet of thin rimed ice, dazzling to the eye, reflecting the light with the intensity, almost, of a chromed mirror. The tail unit was intact. So, too, was the fuselage for half its length, then crumpled and torn underneath, directly opposite the spot where we stood. The left wing was tilted upwards at an angle of about five degrees above the normal—the plane wasn't on such an even keel as I had first thought. From where I stood this wing blocked off my view of the front, but just above and beyond it I saw something that made me temporarily forget the urgency of my concern for those inside and stand there, stockstill, the beam trained unwaveringly on that spot.

Even under the coating of ice the big bold lettering 'BOAC' was clearly visible. BOAC! What on earth was a BOAC airliner doing in this part of the world? The SAS and KLM, I knew, operated trans-Arctic flights from Copenhagen and Amsterdam to Winnipeg, Los Angeles and Vancouver via Sondre Stromfjord, about an hour and a half s flying time away to the south-west on . the west coast of Greenland, just on the Arctic Circle, and I was pretty sure that Pan American and Trans World operated reciprocal services on the same route. It was just barely possible that freak weather conditions had forced one of these planes far enough off course to account for its presence here, but if I was right about the BOAC, it just wasn't possible—

"I've found the door, Dr Mason." Jackstraw had taken my arm, jerking me out of my reverie, and was pointing to a big oval door with its lowest point just at our eye-level. "We will try these, perhaps?"