Somewhere deep beneath them, an engine started to vibrate. McGee had switched on the pumps to eject water from the ballast chambers. The submarine boat was about to rise from the river-bed to nestle under the pier itself. By now the Royal carriage must have disgorged its Passenger. He would be strolling over the gangway to meet the assembled dignitaries of Gravesend.
‘Look sharp, blast you, you old perisher!’ Cribb said.
‘Whassat?’ Thackeray’s eyes opened-and closed again.
‘You’ve got to untie me, man!’
‘Untie me, man,’ repeated Thackeray.
He looked at the clock.
It was five past ten.
The moment when, by all calculations, the course of history should have been altered. All calculations, that is to say, except Sergeant Cribb’s.
It was five past ten and the detonation should have taken place, but Cribb had made quite sure that the Person Who Mattered was in no danger.
The urgency in what was happening under the pier had nothing to do with history. It was simply that Cribb did not intend to suffocate. If Thackeray could be persuaded into consciousness, he would certainly share the intention. Besides, it was unthinkable to be robbed of the pleasure of telling Inspector Jowett how a humble sergeant had foiled a Royal assassination.
On Devlin’s reckoning, there was now enough air left to last them twenty minutes.
Cribb leaned over Thackeray. ‘You’re lying in a steel coffin fifteen feet under the Thames.’
‘Eh!’ Thackeray sat bolt upright.
‘Release me, man, as quick as you can!’ said Cribb.
It cannot be a pleasant experience to nod off after breakfast and wake up with your head pounding and your feet tied together, in an ill-ventilated submarine boat stacked with dynamite. It says much for Thackeray’s quick response to the call of duty that he carried out the order without a word.
The straps proved harder to remove than the ropes, but a few choice exhortations to Thackeray assisted his efforts. Free at last, Cribb rubbed his wrists to restore the circulation. He looked at the clock.
Ten past ten.
It happened that in the moment he chose to look in that direction, he took in McGee in the same glance. The dynamiter, too, had taken note of the time and the apparent failure of Cribb’s infernal machine. He had taken a box of matches from his pocket. He had struck one and was holding it over the nearest open crate of dynamite, waiting for the flame to catch enough of the match to ensure that it would not go out.
‘Hand me a strap,’ Cribb ordered.
Thackeray put one in his hand and he swung it high and with all the force at his command. It whipped down on McGee’s forearm and encircled the wrist. Cribb tugged it back towards him at the same instant, jerking the arm away from the crate. The match fell on the deck and Cribb swept forward and stamped it out. He lifted McGee from the pilot’s seat and laid him on the ground.
‘Put the strap round his arms, Thackeray, and get the matches away from him,’ he ordered. ‘I’m going to try to take us to the surface.’
The difficulty in taking the controls was that he had heard the instructions without seeing which levers served the appropriate purposes. He looked through the glass to see how close they were to the pier. McGee had done his piloting well; the shadowy underside, fringed with weed, was directly overhead. He found the twin levers controlling the ballast chambers and admitted enough water to take them a fathom down. The lever in the centre, he judged, would start the propeller. It did. The submarine boat moved forward and clear of the pier. He switched on the pumps and they slowly ascended.
CHAPTER 15
Thames water was still pouring off the superstructure of the boat when Cribb thrust open the conning-tower lid and looked out. The early mist had given way to a clear, cloudless morning, the waves catching sunlight at a million shimmering points. Thirty yards to the left, the Imperial bunting fluttered bravely from a canvas awning specially erected on Gravesend pier. A trombone flashed as the band dispersed across the gangway. Red, white and blue streamers wreathed serpentine shapes in the current.
The thousand-yard width of Gravesend Reach was studded with river traffic, dominated in midstream by the gleaming lines of the Hildegarde. She was flying the Prince’s standard. The launch which had conveyed him safely across the water was moored alongside. A flotilla of smaller craft cruised interestedly around her.
Somewhere on this stretch of river were the dynamiters, Cribb was confident. Carse would not forgo the pleasure of witnessing the climax of his plan. They would have been skirting the attendant fleet while the ceremonials took place on the pier, smug in their knowledge of what was under the water. And when their expectation was not realised at the proper time, they would have clenched their teeth and cursed clocks that could not be relied upon. If the machine that had blown up the gazebo had been marginally late in operating, perhaps this identical one was going to be the same. Even as the Royal feet had stepped over the gangway to the launch, the dynamiters must still have watched for what might appropriately be called the upshot of all their plans. And if Cribb was any judge of human nature, they would be lingering on yet, looking for some indication of what had gone wrong.
Well, now they had got it. The emergence of the submarine boat told them for certain that the charge had failed to detonate. Not only that; they knew now that the law was bound to pursue them, for Cribb and Thackeray must have survived. Carse would swing the launch towards Northfleet and race upriver on the best head of steam he could raise. There was a good chance of reaching the house by the river and escaping in a carriage before Cribb could muster a posse to pursue them.
It was going to take time to go about it in the orthodox way, he was forced to admit. A request for reinforcements from Gravesend police station would want some explaining when it came from a man in a submarine boat with no identification whatsoever, claiming to be a police officer. An enlightened duty sergeant might be prepared to be convinced after, say, ten minutes of hard talking, but Cribb could not afford to give the dynamiters such a start.
No. He would finish this as he started it: in style.
There was one dependable way of collecting police reinforcements quickly and without argument. He put down the lid of the conning-tower and switched on the propellers, at the same time turning the wheel to set the submarine boat on a course directly in line with the Hildegarde. Devlin had been right: she was a capital craft, easy to handle and quick to accelerate. With the wheel held steady, he opened the ballast chambers and took on enough water to submerge the hull, leaving only the conning-tower visible above the waves.
A hundred yards from the yacht, he surfaced again, gliding audaciously through the inner circle of vessels in support. Through the glass scuttles he noticed a movement on the Hildegarde’s deck; two figures in blazers and white flannels had appeared there, and one was pointing in the direction of the submarine boat. His companion, broadly-built, with neatly-barbered beard, turned to say something to two young women who had appeared behind them with parasols. The prettier of the two stepped forward and linked her arm in his. Cribb swung the wheel to turn the boat in the direction of Northfleet, and discreetly submerged.
When he surfaced two minutes later, he was gratified to see that his stratagem had worked; he now had an escort of three Thames police launches. He switched the engine to full power.
He sighted the dynamiters about 150 yards ahead, gaining what help they could from the tidal current. He would have spotted them earlier if his visibility had not been impaired by the thickness of the glass he had to peer through. He put up the lid of the conning-tower and stood on the pilot’s seat for a better view. He could see Millar on deck, facing his direction, undoubtedly keeping the others informed of the progress of the pursuers.