'"The Phoenicians" was another name for the people of Carthage-the trading state annihilated by Rome in the Third and last Punic War. The state of Carthage approximated modern-day Tunisia, directly south of Italy, across the Mediterranean,' Wizard said.

'And Hamilcar is Hamilcar Barca,' West said, 'father of Hannibal and commander of the Carthaginian forces in the First Punic War. I didn't know he had a refuge, let alone a forgotten one.'

Zoe commented, 'Hamilcar died in Spain in 228 BC, between the First and Second Punic Wars. He must have ordered the construction of a faraway fortress and never lived to see it.'

Wizard was on his computer: 'I'm checking my database for any references to "Hamilcar's Refuge". But I've already found this: the "Deadly Coast" was a name used by Alexandrian sailors to describe the coast of modern-day Tunisia. For 100 miles the sh.o.r.e is all cliffs-400 feet high and plunging vertically into the sea. Major shipwreck area even in the 20th century. Oh dear. If your ship goes down close to the sh.o.r.e, you can't climb out of the water because of the cliffs. People have been known to die within an arm's length of dry land. No wonder the ancient sailors feared it.'

West added, 'And the sixth Great Architect is Imhotep VI. He lived about 100 years after Imhotep V. Clever trap-builder-fortified the island-temple of Philae near Aswan. Known for his predilection for concealed underwater entrances. There are six six at Philae alone.' at Philae alone.'

Stretch said, 'Wait a moment. I thought the Egyptian civilisation was finished by the time of the Punic Wars.'

'A common misconception,' Wizard said. 'People tend to think that the ancient Greek, Roman and Egyptian civilisations existed separately, one after the other, but that's not true, not at all. They coexisted coexisted. While Rome was fighting Carthage in the Punic Wars, Egypt was still flourishing under the Ptolemies. In fact, an independent Egypt would continue to exist right up until Cleopatra VII, the famous one, was defeated by the Romans in 30 BC.'

'So what are these two tridents?' Pooh Bear asked.

'My guess is they are rock formations just out from the coastal cliffs,' Wizard said. 'Markers. Triple-pointed rock formations that look like tridents, marking the location of the Refuge.'

'One hundred miles of sheer-cliffed coast,' Pooh Bear groaned. 'It could take days days to patrol that kind of terrain by boat. And we don't have days.' to patrol that kind of terrain by boat. And we don't have days.'

'No,' West said. 'We don't. But I'm not planning on using a boat boat to scan that coastline.' to scan that coastline.'

An hour later, the Halicarna.s.sus Halicarna.s.sus was soaring high above the Tunisian coast, travelling parallel to it, heading westward, when suddenly its rear loading ramp opened and a tiny winged figure leapt out of the plane and plummeted down through the sky. was soaring high above the Tunisian coast, travelling parallel to it, heading westward, when suddenly its rear loading ramp opened and a tiny winged figure leapt out of the plane and plummeted down through the sky.

It was a man.

West.

Shooming head-first down through the air, his face covered by a wickedly aerodynamic oxygen-supplying full-face helmet.

But it was the object on his back that demanded attention.

A pair of lightweight carbon composite wings wings.

They had a span of 2.6 metres, upturned wingtips, and in their bulky centre (which covered a parachute), they possessed six compressed-air thrusters that could be used to sustain a gliding pattern when natural glide failed.

West rocketed down through the sky at a 45-degree angle, his bullet-shaped winged body slicing through the air.

The Deadly Coast came into view.

Towering yellow cliffs fronted onto the flat blue sea. Giant, immovable. Waves crashed against them relentlessly, exploding in gigantic showers of spray.

West zoomed lower, hitting 180 km/h, before at around 800 feet ...

...he swooped upwards and entered a slower, more serene glide pattern.

Now he soared, three hundred feet above the waves of the Mediterranean, parallel to the ma.s.sive coastal cliffs.

He was flying near the TunisianLibyan border, a particularly desolate stretch of the North African coastline. Broad flat sand-plains stretched away from the sheer cliffs of the coast. About a klick inland, those plains rammed up against a mountain range made up of a few extinct volcanoes that ran parallel to the sh.o.r.e.

It was a land devoid of life. Desolate. Depressing. A place where nothing grows.

As he flew, West scanned the cliffs, searching for any rock formations on them that resembled a pair of tridents.

After ten minutes of gliding, he lost his natural glide pattern, so he ignited a compressed-air thruster. With a sharp hiss-wapp hiss-wapp, it lifted him to a higher alt.i.tude, allowing him to glide for longer.

Then after about forty minutes-and three more compressed-air a.s.sists-he saw them.

Two rock-islands positioned about fifty metres out from the coastal cliff-face, their rocky shapes each resembling a three-fingered human hand pointing toward the sky.

Or a trident.

Two tridents.

The section of cliff immediately behind the two tridents looked particularly forbidding-vertical and rough, with the upper section of the great cliff partially overhanging its base. Very difficult to scale.

'Wizard! Come in!' West called into his radio mike. 'I've found them!'

An hour later, the Halicarna.s.sus Halicarna.s.sus had landed on the flat sandy plain, dropped off a Land Rover four-wheel drive from its belly, and then lifted off to take up a holding pattern a hundred miles to the south. had landed on the flat sandy plain, dropped off a Land Rover four-wheel drive from its belly, and then lifted off to take up a holding pattern a hundred miles to the south.

Bouncing along in the Land Rover, the team joined West-now standing on the windswept cliff overlooking the two tridents. The team numbered seven, since the injured Fuzzy had stayed in the Halicarna.s.sus Halicarna.s.sus with Sky Monster, along with Horus. Big Ears, however, was there and still mobile, thanks to a c.o.c.ktail of painkillers. with Sky Monster, along with Horus. Big Ears, however, was there and still mobile, thanks to a c.o.c.ktail of painkillers.

Technically, they were in Tunisia. The landscape was empty and dry. There wasn't a village or human settlement for fifty miles in any direction.

In fact, the landscape could better be described as a moonscape: the flat sandplain, the occasional meteorite crater, and of course the chain of mountains guarding the landward approach about a kilometre inland.

'You know,' Big Ears said, 'they filmed Star Wars Star Wars in Tunisia. The Tatooine scenes.' in Tunisia. The Tatooine scenes.'

'I can see why,' West said, not turning from the view of the sea. 'It's totally alien.'

Wizard came alongside West, handed him a printout. 'This is the only reference my database has for Hamilcar's Refuge. It's a hand-drawn sketch on papyrus found in a worker's hut in Alexandria, an Egyptian worker who must have worked on Imhotep VI's reconfiguration of Hamilcar's Refuge.'

The papyrus sheet bore a carefully-crafted diagram on it: It was hard to tell exactly what the image depicted. Cut off at the top and bottom, it didn't seem to show the entire structure.

'Aqueducts and guard towers,' West said, 'and a filled-in excavation tunnel. Jesus, this place must be huge.' He scanned the landscape all around him, but saw nothing but barren desert and the harsh coast. 'But if it's so huge, where the h.e.l.l is it?'

He checked his printout of the Euclidian clue: Follow the Deadly Coast of the Phoenicians To the inlet of the two tridents, Where you will behold the easier entrance to The sixth Great Architect's masterwork.

The Seventh has lain there ever since.

'"The inlet of the two tridents",' he read aloud. 'We've found the two tridents, so there's supposed to be an inlet here. But I don't see one. It's all just one seamless coastline.'

It was true.

There was no bay or inlet in the coast anywhere nearby.

'Just hold on a moment ...' Epper said.

He dug into his rucksack and extracted a tripod-mounted device.

'Sonic-resonance imager,' he said, erecting the tripod on the sand. He then aimed it downward downward and hit a switch. 'It'll show us the density of the earth beneath our feet.' and hit a switch. 'It'll show us the density of the earth beneath our feet.'

The sonic-resonance imager pinged slowly.

Piiiing-piiiing-piiiing.

'Solid sandstone. All the way to the imager's depth limit,' Wizard said. 'As you'd expect.'

Then he swivelled the imager on its tripod and aimed it at the ground a few yards to the west, the section of coastline directly in line with the two tridents- Ping-ping-ping-ping-ping-ping ... ...

The imager's pinging went bananas.

West turned to Wizard. 'Explain?'

The old man looked at his display. It read: TOTAL DEPTH: 8.0 m.

SUBSTANCE a.n.a.lYSIS: SILICON OVERLAY 5.5 m; GRANITE UNDERLAY 2.5 m.

Wizard said, 'Depth here is eight metres. Mix of hard-packed sand and granite.'

'Eight metres?' Pooh Bear said. 'How can that be? We're metres?' Pooh Bear said. 'How can that be? We're 130 130 metres above sea level. That would mean there's 92 metres of empty air beneath that section of ground-' metres above sea level. That would mean there's 92 metres of empty air beneath that section of ground-'

'Oh, no way ...' West said, understanding.

'Yes way ...' Wizard said, also seeing it.

West looked back inland at the sandplain stretching to the nearest mountain a kilometre away. The sand appeared appeared to be seamless. 'Amazing the things you can do with a workforce of 10,000 men,' he said. to be seamless. 'Amazing the things you can do with a workforce of 10,000 men,' he said.

'What? What? What?' Pooh Bear said, exasperated. 'Would you two mind telling the rest of us mere mortals what in the blazes you're talking about?'

West smiled. 'Pooh. There was was once an inlet here. I imagine it was a narrow crevice in the coastal cliffs that cut inland.' once an inlet here. I imagine it was a narrow crevice in the coastal cliffs that cut inland.'

'But it's not here now,' Pooh said. 'How does an entire inlet an entire inlet disappear?' disappear?'

'Simple,' West said. 'It doesn't. It's still here. It's just been hidden. Concealed by the labour of 10,000 workers. The keepers of the Capstone put a roof over the inlet, bricked in the entrance and then covered it all over with sand.'

Five minutes later, Jack West Jr hung from the Land Rover's winch cable fifteen metres down the face of the coastal cliff, suspended high above the waves of the Mediterranean Sea.

He probably could have blasted through the eight metres of sand and granite with conventional explosives, but using explosives was risky when you did not know what lay beneath you-it could close off tunnels or pa.s.sageways in the system below; it could even bring down the entire structure, and West's team didn't have the time or the manpower to sift through thousands of tons of rubble for months.

West now aimed Wizard's sonic-resonance imager at the vertical cliff-face in front of him.

Ping-ping-ping-ping-ping-ping ... ...

Once again the imager's pinging went wild.

The display read: TOTAL THICKNESS: 4.1 m.

SUBSTANCE a.n.a.lYSIS: SANDSTONE OVERLAY 1.6 m; GRANITE UNDERLAY 2.5 m.

West gazed at the cliff-face in wonder. It looked exactly like the rest of the coastline: same colour, same texture; rough and weatherworn.

But it was a hoax, a ruse, an entirely artificial artificial cliff. cliff.

A false wall.

West smiled, called up. 'It's a false wall! Only four metres thick. Granite, with a sandstone outer layer.'

'So where is the entrance?' Zoe asked over his radio.

West gazed straight down the sheer cliff-face-at the waves crashing at its base.

'Imhotep VI reconfigured this one. Remember what I said before: he was known for his concealed underwater entrances. Haul me up and prep the scuba gear.'

Minutes later, West again hung suspended from the Land Rover's superlong winch cable, only now he had been lowered all the way down the false cliff-face. He dangled just a few metres above the waves crashing at its base.

He was wearing a wetsuit, full face-mask, and a lightweight scuba tank on his back. His caving gear-fireman's helmet, X-bars, flares, ropes, rockscrew drill and guns-hung from his belt.

'Okay! Lower me in, and do it fast!' he called into his throat-mike.

The others obeyed and released the cable's spooler, lowering West into into the churning sea at the base of the cliff. the churning sea at the base of the cliff.

West plunged underwater- -and he saw it immediately.

The vertical cliff continued under the surface, but about 6 metres below the surface it stopped at a distinctly man-made opening: an enormous square doorway. It was huge. With its bricked frame, the doorway looked like a great aeroplane hangar door carved into the submerged rockface.

And engraved in its upper lintel was a familiar symbol: West spoke into his face-mask's radio. 'Folks. I've found an opening. I'm going in to see what's on the other side.'

Guided by his Princeton-Tec underwater flashlight, West swam through the doorway and into an underwater pa.s.sage that was bounded by walls of granite bricks.

It was a short swim.

About ten metres in, he emerged into a much wider area-and instantly felt the tug of unusually strong tidal motion.

He surfaced in darkness.

While he couldn't see beyond the range of his flashlight, he sensed that he was at one end of a vast internal s.p.a.ce.