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uld be hitting now；〃 and two or three seconds later； 〃We should be hearingnow。〃
Whoever had been responsible for the settings and time calculations on that torpedo had known what he was about。 Just at Hansen's second 〃now〃 we felt as much as heard the clanging vibration along the 〃Dolphin's〃 hull as the shock waves from the exploding warhead reached us。 The deck shook briefly beneath our feet； but the impact was nowhere nearly as powerful as I had expected。 I was relieved。 I didn't have to be a clairvoyant to know that everyone was relieved。 No submarine bad ever before been in the vicinity of a torpedo detonating under the ice pack； no one had known to what extent the tamping effect of overhead ice might have increased the pressure and destructive effect of the lateral shock waves。
〃Nicely；〃 Swanson murmured。 〃Very nicely done indeed。 Both ahead one third。 I hope that bang had considerably more effect on the ice than it had on our ship。〃 He said to Benson at the ice machine； 〃Let us know as soon as we reach that lead； will you？〃
He moved to the plotting table。 Raeburn looked up and said： 〃Five hundred yards gone； five hundred to go。〃
〃All stop；〃 Swanson said。 The slight vibration of the engines died away。 〃We'll just mosey along very carefully。 That explosion may have sent blocks of ice weighing a few tons apiece pretty far down into the sea。 I don't want to be doing any speed at all if we meet any of them on the way up。〃
〃Three hundred yards to go；〃 Raeburn said。
〃All clear。 All clear all around；〃 the sonar room reported。
〃Still thick ice；〃 Benson intoned。 〃Ah！ That's it。 We're under the lead。 Thin ice。 Well； five or six feet。〃
〃Two hundred yards；〃 Raeburn said。 〃It checks。〃
We drifted slowly onward。 At Swanson's orders the propellers kicked over once or twice； then stopped again。
〃Fifty yards；〃 Raeburn said。 〃Close enough。〃
〃Ice reading？〃
〃No change。 Five feet； about。〃
〃Speed？〃
〃One knot。〃
〃Position？〃
〃One thousand yards exactly。 Passing directly under target area。〃 …
〃And nothing on the ice machine？ Nothing at all？〃
〃Not a thing。〃 Benson shrugged and looked at Swanson。 The captain walked across and watched the inked stylus draw its swiftly etched vertical lines on the paper。
〃Peculiar； to say the least；〃 Swanson murmured。 〃Seven hundred pounds of very high…grade amatol in that torpedo。 Must be unusually tough ice in those parts。 Again； to say the least。 We'll go up to ninety feet and make a few passes under the area。 Floodlights on； TV on。〃
So we went up to ninety feet and made a few passes and nothing came of it。 The water was pletely opaque； the floods and camera useless。 The ice machine stubbornly registered four to six feetit was impossible to be more accurateall the time。
〃Well； that seems to be it；〃 Hansen said。 〃We back off and try again？〃
〃Well； I don't know；〃 Swanson said pensively。 〃What do you say we just try to shoulder our way up？〃
〃'Shoulder our way up？'〃 Hansen wasn't with him； neither was I。 〃What kind of shoulder is going to heave five feet of ice to one side？〃
〃I'm not sure。 The thing is； we've been working from unproved assumptions and that's always a dangerous basis。 We've been assuming that if the torpedo didn't blow the ice to smithereens； it would at least blow a hole in it。 Maybe it doesn't happen that way at all。 Maybe there's just a big upward pressure of water distributed over a sizable area that heaves the ice up and breaks it into pretty big chunks that just settle back into the water again in their original position in the pattern of a dried…up mud hole with tiny cracks all around the isolated sections。 But with cracks all around。 Narrow cracks； but there。 Cracks so narrow that the ice machine couldn't begin to register them even at the slow speed we were doing。〃 He turned to Raeburn。 〃What's our position？〃
〃Still in the center of the target area； sir。〃
〃Take her up till we touch the ice；〃 Swanson said。
He didn't have to add any cautions about gentleness。 The diving officer took her up like floating thistledown until we felt a gentle bump。
〃Hold her there；〃 Swanson said。 He peered at the TV screen； but the water was so opaque that all definition vanished halfway up the sail。 He nodded to the diving officer。 〃Kick her uphard。〃
pressed air roared into the ballast tanks。 Seconds passed without anything happening； then all at once the 〃Dolphin〃 shuddered as something very heavy and very solid seemed to strike the hull。 A moment's pause； another solid shock； and then we could see the edge of a giant segment of ice sliding down the face of the TV screen。
〃Well； now； I believe I might have had a point there；〃 Swanson remarked。 〃We seem to have hit a crack between two chunks of ice almost exactly in the middle。 Depth？〃
〃Forty…five。〃
〃Fifteen feet showing。 And I don't think we can expect to lift the hundreds of tons of ice lying over the rest of the hull。 Plenty of positive buoyancy？〃
〃All we'll ever want。〃
〃Then we'll call it a day。 Okay； quartermaster； away you go up top and tell us what the weather is like。〃
I didn't wait to hear what the weather was like。 I was interested enough in it； but I was even more interested in making sure that Hansen didn't e along to his cabin in time to find me putting on the Mannlicher…Schoenauer along with my furs。 But this time I stuck it not in its special holster but in the outside pocket of my caribou trousers。 I thought it might e in handier there。
It was exactly noon when I clambered over the edge of the bridge and used a dangling rope to slide down a great rafted chunk of ice that slanted up almost to the top of the sail。 The sky had about as much light in it as a late twilight in winter when the sky is heavy with gray cloud。 The air was as bitter as ever； but； for all that； the weather had improved。 The wind was down now； backed around to the northeast； seldom gusting at more than twenty mph； the ice spicules rising no more than two or three feet above the ice cap。 Nothing to tear your eyes out。 To be able to see where you were going on that damned ice cap made a very pleasant change。
There were eleven of us altogether： mander Swanson himself； Dr。 Benson； eight enlisted men and myself。 Four of the men were carrying stretchers with them。
Even 700 pounds of the highest grade conventional explosive on the market hadn't managed to do very much damage to the ice in that lead。 Over an area of seventy yards square or thereabouts the ice had fractured into large fragments curiously uniform in size and roughly hexagonal in shape but fallen back so neatly into position that you couldn't have put a hand down most of the cracks between the adjacent fragments of ice： many of the cracks； indeed； were already beginning to e together。 A poor enough performance for a torpedo warheaduntil you remembered that though most of its disruptive power must have been directed downward； it had still managed to lift and fracture a chunk of the ice cap weighing maybe 5；000 tons。 Looked at that way； it didn't seem such a puny effort after all。 Maybe we'd been pretty lucky to achieve what we had。
We walked across to the eastern edge o