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       FIGURE 2

       German submarine U-boat, type V11C

       The U-boat

      Since the First World War, submarine design had improved only marginally, and then chiefly in greater hull strength. This enabled them to dive far deeper, and provided escape for many U-boats under attack. (Due largely to inter-departmental squabbles, it took some time before British depth charges were designed for deep water use.) Although more efficient electric batteries enabled submarines to stay submerged longer, they still spent almost all their time on the surface, submerging only to escape attacks from the air or avoid very rough seas.

      A submarine of this period consisted of a cylindrical pressure hull like a gigantic steel sewer pipe. To this pipe, a stern and bow were welded and the whole vessel was clad in external casing to give it some ‘sea-keeping capability’, although submarines could never be manoeuvred like ships with regular hulls. A casing deck and a conning tower – what the Germans called an ‘attack centre’ – was added to the structure. Directly below the conning tower was the ‘control room’ where the captain manned the periscope. The tower was given outer cladding to provide some weather protection to men standing there, as well as some measure of streamlining when the boat went underwater. An electric motor room and an engine room with supercharged diesels of about 3,000 bhp were positioned well aft for the sake of sea-keeping and to cut diving time. The great bulk of a submarine was below the water-line, and visitors going below are always surprised to discover how big they are, compared with the portion visible above water. For instance, the long-range Type IXC U-boat that displaced 1,178 tons submerged would still displace 1,051 tons when on the surface.

      There were two basic types of German U-boat used operationally in the Atlantic campaign, the big long-range Type IX and the smaller Type VII, which was the standard German U-boat of the Second World War.⁵ The VII typically had a displacement of 626 tons, a crew of four officers and forty-four ratings (enlisted men), and carried about fourteen 21-inch torpedoes. Four tubes faced forward and one aft. All the tubes were kept loaded and when they had been fired, the awkward business of reloading had to be done. On the surface the diesel engines gave a range of 7,900 nautical miles at 10 knots. If they pushed the speed up to 12 knots it would reduce their range to 6,500 nautical miles. In an emergency the diesels could give 17 knots for short periods. With a fully trained crew a Type VII dived in thirty seconds and when submerged used electric motors. The rechargeable batteries could go for about 80 nautical miles at 4 knots. Maximum speed underwater was reckoned to be 7.5 knots, depending upon gun platforms which obstructed the water flow. Most reference books give manufacturer’s specification speeds which are faster than this.

      The whole purpose of the submarines was to fire torpedoes. These big G7 – seven metres long – devices were no less complicated than the submarine itself, and in some respects exactly like them. They were treated with extraordinary care. Each torpedo arrived complete with a certificate to show that its delicate mechanisms had been tested by firing over a range. It had been transported in a specially designed railway wagon to avoid risk of it being jolted or shaken. One by one, with infinite concern, the ‘eels’ were loaded into the U-boat, which was usually moored inside a massive concrete pen. From then onwards, all through the voyage, each and every eel would be hung up in slings every few days, so that the specialists could check its battery charge, pistols, propellers, bearings, hydroplanes, rudders, lubrication points and guidance system.

      To make an attack it was necessary to estimate the bearing and track of the target. Usually the submarine was surfaced, and the captain used the UZO (U-Boot-Zieloptik) which was attached to its steel mounting on the conning tower. This large binocular device had excellent light-transmission capability, even in semi-darkness, and from it the bearing, range and angle of the target vessel was sent down to the Vorhaltrechner. This calculator sent the target details to the torpedo launch device, Schuss-Empfänger, and right into the torpedoes, continuing to adjust the settings automatically as the U-boat moved its relative position. By means of these instruments the U-boat did not have to be heading for its target at the moment of launching its torpedo. The torpedo’s gyro mechanism would correct its heading after exiting the tube. Thus a ‘fan’ of shots, each on a slightly different bearing, could be fired without turning the boat. This device was coveted by British submarine skippers who aimed their torpedoes by heading their submarines towards the target.

      By using ‘wakeless’ electric G7e torpedoes – and suppressing the water swell – a submarine could fire without betraying its position. Smaller targets were sunk by means of the deck gun, which was usually an 8.8-cm artillery piece. To fire it in anything but calm water without going overboard demanded the agility of an acrobat. Hitting anything other than a large target was very difficult. When war began there was also a single 2-cm Flak gun (short for Flugabwehrkanone, anti-aircraft gun) but this proved of little use against aircraft and bigger and better ones were fitted as the war continued.

      Life aboard a submarine was rigorous. The hull’s interior was the size and shape of a passenger train but the ‘train’ was crammed with machinery into which the men were artfully fitted. There was no privacy whatever for anyone. Even the captain had no more than a curtained desk, past which everyone pushed to get to their stations. This is how an official German navy war correspondent saw it:

      My bunk is in the petty officers’ quarters, the U-room, the most uncomfortable on board: it has the most through traffic. Anyone who wants to get to the galley, or to the diesels or the E-motors has to come through here. At every change of watch the men from the engine room squeeze through from astern, and the new watch comes through from the control room. That means six men each time. And the stewards have to work their way past with their full dishes and pots. In fact, the whole place is nothing more than a narrow corridor with four bunks on the right and four on the left. In the middle of the passage, screwed to the floor, there’s a table with folding leaves. The space on both sides is so narrow that at mealtimes the men have to sit on the lower bunks with their heads bent. There is far too little space for stools. And there is mess and confusion whenever someone has to get from the engines to the control room or vice versa during a meal.⁶

      There were no bathing facilities, and only one lavatory which could not be used when the submarine dived. When under attack the lavatory might well be out of action for 24 hours. No one shaved and most didn’t change even one article of clothing for the entire voyage. The stink of human bodies was mixed with those of oil and fuel. There was also the pervading smell of mould, for in the damp air everything, from bread to log books, went mouldy. The men – mostly young, for only young men could endure the hardships and the stress – were apt to douse themselves in eau de cologne to exchange one smell for another.

      The Commander is astride the periscope saddle in the narrow space between the periscope shaft and the tower wall, his face pressed against the rubber shell, his thighs spread wide to grip the huge shaft. His feet are on the pedals

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