Any of my readers who have ever seen in illustrated papers sketches of the control-room or of the conning-tower of a U-Boat will understand this. Indeed, when they are face to face with such a wild medley of rudders, valves, screws, cocks, tubes and pipes, with such a bewildering conglomeration of levers and apparatus, each of which has a highly important meaning and purpose, let them take comfort. My impressions were just the same.

But when this tube-like monster was christened, and her giant grey-green body slipped majestically and silently into the water, she was suddenly transformed into a seafaring vessel, a vessel that swam in her rightful element, as if she had always done so. The first time I trod her narrow deck and climbed into the conning-tower and on to the navigation platform, it was only from her sides, where the green body swelled massively out of the water, that it was possible even faintly to realise how enormous her hull must be.

With proud delight my eyes travelled over the whole structure, as it swayed lightly beneath me, delicacy and strength symbolically blended.

Now I knew that what had hitherto appeared to me as a monstrous product of technical imagination, was a ship, in which I could travel the seas—a real ship—on which an old seaman could set his affections.

Then I laid my hand on the parapet of the conning tower of the "Deutschland" and swore to be true to her.

And in this manner I struck the "Deutschland" and became commander of the first submarine merchant-trader.

CHAPTER II
THE TRIAL AND DEPARTURE

And now a strange and wonderful time followed. Day after day, out into the bays, down into the depths. We practised in all weathers and under all conditions.

Every man of the chosen crew realised the task that lay before us. It meant acquiring the art of managing this most delicate and complicated vessel, the last word in bold and skilful construction. It meant learning to know and understand that marvellous wonder-work of modern shipbuilding—a submarine. We had to be in a position to sway, according to our will, this heavy mass of nearly 2000 tons, so that she should obey the least pressure of the rudder, so that she should twist and manœuvre like a torpedo-boat, so that she should rise and sink in the water like a dirigible in the air.

It meant probing the trustworthiness of the unyielding steel body, the weight and pliability of her mighty machinery; getting on the track of her imperfections or tricks, and coaxing from her the secrets of her mobility and fantastic fish nature.