‘However, Major, I will be candid with you. I think you deserve that. The bomb uses an energy that is new, untested and untapped, an energy that lies all around us. We are in the position to be the first men to use it in war. And, if it isn’t we that use it, then it will be someone else who does. Be sure of that.’

Hauser stood up and approached the door to the room.

‘Of course, there is an element of risk in using this technology, but it is a calculated risk. If we turn our backs on this opportunity now, then we’re all dead men. The Russians will finish us all. And in time, they no doubt will attempt to use this energy on the Americans. That is a certainty.’

Hauser turned to face him. ‘It will happen, Major. This energy will be discovered and used by someone. Why not let it be us?’

‘And how great is the risk?’ asked the Major.

‘The risk, Major, is small, but remains a possibility.’

‘What exactly is the risk in using this weapon?’ Rall asked again.

Hauser closed the door gently and spoke in a hushed voice. ‘That the energy we use to destroy New York will destroy us all.’

In that moment, the cigarettes were forgotten.

Max could hear now only the murmur of voices from inside Rall’s study. The last words he’d heard before the door had closed had been Rall’s. Max silently left the canteen, walked up the bunker’s central corridor, up the stairs and outside into the dark of night.

What exactly is the risk of using this weapon? he had heard the Major say. There had been uncertainty in the Major’s voice. And that fact alone troubled Max.

Chapter 31

Into the Water

1 a.m., 29 April 1945, off the coast of France

Lundstrom stared silently at the pitch-black form of the coastline. It was silhouetted against a faint orange sky. A low cloud base reflected the night-time amber glow of the city of Nantes. Isolated pinpricks of light dotted the dark landmass and suggested the occasional cottage or farmhouse, but he could see no other detail or definition from the shore. This kind of amphibious deployment of troops was dangerous enough in the daytime, let alone doing it at night with no detailed knowledge of the stretch of shore they intended to land on.

He had no idea what the objectives were for the young captain and his platoon, but whatever the mission, he hoped it was going to be worth the risks they were taking. There was a very real possibility that some of these poor boys might not make it to shore. The sea was lively tonight, with four-foot swells slapping against the side of the sub, and they had no notion of what sort of terrain led down to the sea here.

They could be trying to row ashore onto a lethal barricade of razor-sharp rocks.

Koch and his men were intending to paddle towards the French coast in three inflatable dinghies, across half a mile of choppy sea. He had dared not take the U-boat any closer for fear of grounding her. The men were wearing enough clothing and equipment to sink them like rocks if they fell out or, worse, one of the dinghies was punctured.

He hoped to God this foolish exercise had a point.

Once more he scanned the black world around him and strained his ears to detect any noise other than the chop of water against the sub’s hull. There was nothing to be seen or heard; it seemed as if they were safe here in the dark, for now.

Lundstrom called down through the open hatch in the floor of the conning tower. ‘All clear.’

Seconds later he was relieved to hear a deep, bass throbbing as the diesel motors started up. The ‘all clear’ had made its way aft to the engine room in mere seconds, and already the engines had started turning and were recharging the batteries. One of the first things any rating learned in the Kriegsmarine was that a good sub captain never wastes a single solitary second on the surface.

‘Tell Hauptman Koch he and his men can come up now.’

He heard the order echoing down the ranks inside the sub, and moments later the hatch on the foredeck was pulled open, and several of Koch’s men emerged. They pulled up onto the deck three folded rubber bundles, which they opened out and began to fill with air using foot pumps.

He shook his head. This little venture had the feeling of a disastrous balls-up waiting to happen. These dinghies were all that could be produced at short notice for the mission. They would be a poor offering as a life raft; they were certainly less than adequate for an amphibious landing. And although he had no doubt that the men were fine soldiers, Lundstrom wondered whether these Alpine troops, trained for combat in arctic and mountainous conditions, were ready for this kind of action.

He heard boots on the ladder leading up to the conning tower. Koch emerged beside him and gleefully sucked in a lungful of the chilly, salty air.

‘I imagine that tastes pretty good after the last few days below, eh?’ said Lundstrom.

The young man nodded. ‘Very good. I don’t know how you and your men can stand to live in such conditions.’