“This winter, when Barlennan can’t hope to travel, will last only another three and a half months,” the assistant director started almost without preamble. “We have several reams of telephotos up here which are not actually fitted into a map, although they’ve been collated as far as general location is concerned. We couldn’t make a real map because of interpretation difficulties. Your job for the rest of this winter will be to get in a huddle with those photos and your friend Barlennan, turn them into a usable map, and decide on a route which will take him most quickly to the material we want to salvage.”

“But Barlennan doesn’t want to get there quickly. This is an exploring-trading voyage as far as he’s concerned, and we’re just an incident. All we’ve been able to offer him in return for that much help is a running sequence of weather reports, to help in his normal business.”

“I realize that. That’s why you’re down there, if you remember; you’re supposed to be a diplomat. I don’t expect miracles — none of us do — and we certainly want Barlennan to stay on good terms with us; but there’s two billion dollars’ worth of special equipment on that rocket that couldn’t leave the pole, and recordings that are literally priceless — ”

“I know, and I’ll do my best,” Lackland cut in, “but I could never make the importance of it clear to a native — and I don’t mean to belittle Barlennan’s intelligence; he just hasn’t the background. You keep an eye out for breaks in these winter storms, so he can come up here and study the pictures whenever possible.”

“Couldn’t you rig some sort of outside shelter next to a window, so he could stay up even during bad weather?”

“I suggested that once, and he won’t leave his ship and crew at such times. I see his point.”

“I suppose I do too. Well, do the best that you can — you know what it means. We should be able to learn more about gravity from that stuff than anyone since Einstein.” Rosten signed off, and the winter’s” work began.

The grounded research rocket, which had landed under remote control near Mesklin’s south pole and had failed to take off after presumably recording its data, had long since been located by its telemetering transmitters. Choosing a sea and/or land route to it from the vicinity of the Bre&s winter quarters, however, was another matter. The ocean travel was not too bad; some forty or forty-five thousand miles of coastal travel, nearly half of it in waters already known to Barlennan’s people, would bring the salvage crew as close to the helpless machine as this particular chain of oceans ever got. That, unfortunately, was some four thousand miles; and there simply were no large rivers near that section of coast which would shorten the overland distance significantly.

There was such a stream, easily navigable by a vessel like the Bree, passing within fifty miles of the desired spot; but it emptied into an ocean which had no visible connection with that which Barlennan’s people sailed. The latter was a long, narrow, highly irregular chain of seas extending from somewhat north of the equator in the general neighborhood of Lackland’s station almost to the equator on the opposite side of the planet, passing fairly close to the south pole on the way — fairly close, that is, as distances on Mesklin went. The other sea, into which the river near the rocket emptied, was broader and more regular in outline; the river mouth in question was at about its southernmost point, and it also extended to and past the equator, merging at last with the northern icecap. It lay to the east of the first ocean chain, and appeared to be separated from it by a narrow isthmus extending from pole to equator — narrow, again by Mesklinite standards. As the photographs were gradually pieced together, Lackland decided that the isthmus varied from about two to nearly seven thousand miles in width.

“What we could use, Barl, is a passage from one of these seas into the other,” remarked Lackland one day. The Mesklinite, sprawled comfortably on his ledge outside the window, gestured agreement silently. It was past midwinter now, and the greater sun was becoming perceptibly dimmer as it arched on its swift path across the sky to the north. “Are you sure that your people know of none? After all, most of these pictures were taken in the fall, and you say that the ocean level is much higher in the spring.”