“I can swim,” I said. “You needn’t be afraid.”

“But the waves’ll sweep you away.”

“There aren’t any waves. Watch this biscuit tin. The top of the Atlantic, at this moment, is like a string which is being twanged. The vibrations are a hundred yards across, or more, and they look as though they were travelling along the string; I suppose they are travelling along the string; but a fly sitting on the string doesn’t travel along with the vibrations, it only travels up and down. If I go in to bathe I shan’t be swept away.”

The Captain hadn’t thought of it in that light. He tried to argue—but my biscuit tin answered his argument. And eventually he allowed me to have the ladder lowered; I stripped, descended the ladder, and launched myself into the sea.

I struck out, to get clear of the ship, then ceased swimming and looked around me. The sea was coldish, but not unendurable—and anyhow I was too much in love with my situation to bother about that. Behind me the Peterhof towered, like a cliff; I had never realised, before, how big a five-thousand-ton vessel looks from the water. At her rail I could see a cluster of the crew, watching me; the Captain on the poop. From somewhere in the interior of the ship came the sound of hammering—the engineers at work—and I noticed that this sound reached me more clearly now than when I was on board.

But if the Peterhof appeared strange, from the water, how much stranger was the view in the opposite direction! Or rather, the absence of view!

The ground-swell had looked formidable when I was on the Peterhof’s deck; here its aspect was terrific. The crystalline slope in which I was cradled seemed to reach the sky; yet, without having climbed it, I immediately found myself, instead of looking up the slope, looking down it—down an oblique abyss of gleaming profundity. I seemed to fall and fall and fall; nevertheless, there was no spasm of nausea; although I was falling I was supported, sensuously, in my fall ... and I never reached the finish of the fall; it merged, imperceptibly, into an ascent; and a moment later I was surveying a fresh trough of glassiness, or else gazing audaciously downward, downward on to the deck of the Peterhof.

It was overwhelming. Never in all my life have I attained to a rapture comparable with that bathe in mid-Atlantic. I knew, even at the time, that it would be unforgettable. I had aspired to be able to say that I had swum in water three miles deep ... oh, never mind what vain boast I had promised myself. Boasting was forgotten. I was experiencing. I was surrendered to an ecstasy, an enchantment, a glee, beyond expression grandiose and delicious. I lolled in the pellucid water, not troubling to swim. I let myself go, in those dizzy soarings and sinkings; I abandoned myself to this vast and beautiful force; I felt at once infinitely little and infinitely great.

The whole adventure was half terrifying and half ... well, comfortable. Perched on the crown of one of those flawless ridges I felt, as I toppled over, that I must either be smashed to pieces at the end of the plunge or engulfed in some horrid undertow. But I knew that nothing of the sort would happen. Quietly I paddled with my arms and feet; almost contemptuously I gave myself to the puissant and colossal rhythm which swayed me as high as a cathedral at every swing and then gently rocked me down as deep as a valley. I tell you, the sensation was sublime ... and I hadn’t even got my hair wet!

I remembered, in the middle of my bliss, this perfectly incongruous fact that I hadn’t got my hair wet, and I prepared to “duck.” But at that moment I heard a shout from the deck of the Peterhof.