Jack glanced at Costas, looking at the grapple-gun handle just visible in his boilersuit. Costas nodded almost imperceptibly.
Jack held his breath. If the virus was in there, they were set for a deadly standoff in which there could be no winners. If it was empty, then he and Costas could seize the moment and gain the upper hand. He thought of Hoffman, of the U-boat outside with the fired torpedo tube, of Heidi’s absolute faith that Ernst would have done the right thing.
Saumerre opened the door to the safe.
It was empty.
Costas whipped out the grapple gun and held it to Saumerre’s neck. Jack picked up the palladion and thrust it at the other man, who buckled under the weight, falling on his knees and allowing Jack to slam his fist into his temple and knock him out. He picked up the palladion, grabbed the satchel and retreated through the hatch to the first sphere. Costas followed, keeping his gun trained on Saumerre, who seemed too stunned to move. ‘Visor down,’ Jack yelled, closing his own visor and waiting until Costas had done the same before unscrewing the regulators from the two tanks and cracking the valves open, thankful that their closed helmets dulled the noise of two-thousand-odd p.s.i. of compressed air escaping in such a confined space. After about twenty seconds the noise abated and the tanks emptied. Jack unhooked the hose from his own backpack and vented it for good measure, so that there was enough air in the chamber to ensure that Saumerre survived for at least a couple of hours. He hooked the hose back into his helmet, strapped the package with the palladion to his chest, and looked at Costas. ‘Let’s get out of here.’
They donned their fins and dropped one after the other through the entry hatch at the base of the sphere, then swam off over the U-boat. Jack checked his air pressure. He had vented half of his supply, but there was little risk with the surface only fifteen metres above them and Costas beside him with virtually full tanks in case of emergency. They stopped together beneath the crack between the rocks that led to the surface. ‘Good to go?’ Costas asked.
Jack looked around. There was one thing he had not seen. There had been no ancient symbols, no artefacts. He knew they would come back here after Saumerre was removed, would scour the place, but he still wanted to know now. He had spotted only one opening leading off the main chamber, about ten metres deeper beyond the bow section of the U-boat, a tunnel in the wall. He pointed. ‘I’d like to have a quick look down there.’
‘It’s too deep for the Ahnenerbe divers, probably almost thirty metres,’ Costas said. ‘We have to remember that the Nazi divers only had pure oxygen and that becomes toxic below ten metres depth. If you’re looking for the place where they might have found those symbols, that can’t be it.’
‘It could lead into a shallower cavern. And if you look at the wall directly ahead of us above that tunnel, there’s a place where I think there was a fissure connecting with this chamber, at about fifteen metres. It looks as if it was blocked by the explosions. That depth would have just about been possible with primitive oxygen rebreathers.’
‘How’s your air supply?’
‘Not a lot of margin, but if you stay close by, we’ll be fine.’
‘It’ll be an overhead environment in there, Jack. We haven’t got a safety line or spare tanks.’
‘No more than twenty metres in, I promise.’
Costas paused for a moment, floating still. ‘Okay. Your call.’ They dropped down and were soon at the tunnel entrance, a jagged hole about three metres wide and five metres long. They swam through into another chamber, the size of a small church, the walls rising high above them on every side. Jack ascended until his depth gauge read fifteen metres. Costas swam off to one side, looking hard at the cave walls, searching for anything man-made. ‘I’m remembering Lanowski’s CGI model of this place about 5500 BC. Where we are now would have been inside one of the hills he thought lay on either side of the cavern that became the blue hole. We’d have been maybe ten metres above sea level at this point. I’m just thinking of a guy in a boat arriving here after a trip across the Atlantic, exhausted, famished, thinking he’d seen the promised twin-peaked volcano but then realizing it was an illusion, yet still needing shelter. The cavern below us would have been a subterranean cave beside the sea, perfect for pulling a boat into during a storm. Where we are, higher up, could have been a separate cavern, almost like a mezzanine. You can imagine him finding a way up the rock and holing up here.’
‘And slowly going mad,’ Jack said.
‘Maybe not so slowly,’ Costas replied. ‘If it was hurricane season, he could have collected rainwater from the rock pools on the surface, and anyone who’d survived an Atlantic crossing on an open boat like that must have been a reasonably adept fisherman. But once the rains stopped, that would have been it. He would have had to move on. I don’t see him building a new Atlantis here.’
Jack stared at the walls, remembering Heidi’s description of the underwater cave in the primitive photograph she had seen, and knowing himself what he was looking for. Suddenly he spotted something close to the base of the ledge of the upper cavern, and swam towards it. As he got close to the wall, his heart began to pound. ‘Bingo,’ he said.
Costas swam towards him, Together they stared at a line of five carved symbols, eroded and obscured by marine growth. ‘Look at that,’ Jack exclaimed. ‘Those first three symbols: the pectiform symbol, the half-moon and the cluster of dots. That’s what Katya identified from the Stone Age code as the shaman name for Noah, Uta-Napishtim. It’s identical to the name Little Joey saw on the cave wall in Atlantis, except here I don’t see the symbols for Enlil-Gilgamesh. After Noah’s name, there’s the Atlantis symbol. And finally there’s the half-moon with dots over it, the symbol Katya interprets as meaning “west”.’
‘It’s like a carving on one of those castle dungeon walls in England. “I was here.”’
‘Dungeon is probably about right,’ Jack said. ‘But I think it says more than that. I think it says Noah-Uta-napishtim was here, from Atlantis, or going to Atlantis, to the west. It’s fantastic. It’s exactly what I wanted to find. It confirms one of the greatest voyages of discovery in prehistory, the fact that travellers from the most ancient civilization of the Old World went across the Atlantic more than seven thousand years ago. And I know where he was heading. I know where the new Atlantis lies.’
‘Jack, we have to move. Now.’
Jack felt a tug on his legs, but Costas was now several arm’s lengths away, moving rapidly across the cavern but somehow without finning. Jack suddenly realized what had happened. The tide had turned . He saw Costas drop down to the tunnel and begin to fin hard, making slow progress against the current that was suddenly racing through the lower part of the chamber from the blue hole into the bowels of the reef beyond. Jack realized that he was being propelled around the upper part of the chamber in an eddy created by the current, but he found it impossible to follow it to the point where Costas had managed to get down to the tunnel. He saw that Costas had disappeared, but his voice crackled on the intercom. ‘Jack. I’m through. There’s no way you can follow me now. The current must have increased by three knots in the last minute. It’s like a vortex in here, a twister that’s sucking the water down. But I’ve got a line I’m going to feed back into the hole for you to grab. I should be able to pull you through.’