Now, at last, they hovered over the ancient temple complex of the healing god Asclepius, where they could hopefully find the physician’s cure and maybe also some ambrosia, nectar and Fonzies, because Leo’s supplies were running low.
Next to him on the quarterdeck, Percy peered over the railing.
‘Looks like more rubble,’ he noted.
His face was still green from his underwater poisoning, but at least he wasn’t running to the bathroom to upchuck quite so often. Between him and Hazel’s seasickness, it had been impossible to find an unoccupied toilet onboard for the past few days.
Annabeth pointed to the disc-shaped structure about fifty yards off their port side. ‘There.’
Leo smiled. ‘Exactly. See, the architect knows her stuff.’
The rest of the crew gathered around.
‘What are we looking at?’ Frank asked.
‘Ah, Señor Zhang,’ Leo said, ‘you know how you’re always saying, “Leo, you are the only true genius among demigods”?’
‘I’m pretty sure I never said that.’
‘Well, turns out there are other true geniuses! Because one of them must have made that work of art down there.’
‘It’s a stone circle,’ Frank said. ‘Probably the foundation of an old shrine.’
Piper shook her head. ‘No, it’s more than that. Look at the ridges and grooves carved around the rim.’
‘Like the teeth of a gear,’ Jason offered.
‘And those concentric rings.’ Hazel pointed to the centre of the structure, where curved stones formed a sort of bull’s-eye. ‘The pattern reminds me of Pasiphaë’s pendant: the symbol of the Labyrinth.’
‘Huh.’ Leo scowled. ‘Well, I hadn’t thought of that. But think mechanical. Frank, Hazel … where did we see concentric circles like that before?’
‘The laboratory under Rome,’ Frank said.
‘The Archimedes lock on the door,’ Hazel recalled. ‘It had rings within rings.’
Percy snorted. ‘You’re telling me that’s a massive stone lock? It’s, like, fifty feet in diameter.’
‘Leo might be right,’ Annabeth said. ‘In ancient times, the temple of Asclepius was like the General Hospital of Greece. Everybody came here for the best healing. Aboveground, it was the size of a major city, but supposedly the real action happened belowground. That’s where the high priests had their intensive-care super-magical-type compound, accessed by a secret passage.’
Percy scratched his ear. ‘So, if that big round thing is the lock, how do we get the key?’
‘Way ahead of you, Aquaman,’ Leo said.
‘Okay, do not call me Aquaman. That’s even worse than water boy.’
Leo turned to Jason and Piper. ‘You guys remember the giant Archimedes grabber arm I told you I was building?’
Jason raised an eyebrow. ‘I thought you were kidding.’
‘Oh, my friend, I never kid about giant grabber arms!’ Leo rubbed his hands in anticipation. ‘It’s time to go fishing for prizes!’
Compared to the other modifications Leo had made to the ship, the grabber arm was a piece of cake. Originally, Archimedes had designed it to pluck enemy ships out of the water. Now Leo found another use for it.
He opened the hull’s forward access vent and extended the arm, guided by the console monitor and Jason, who flew outside, yelling directions.
‘Left!’ Jason called. ‘A couple of inches – yeah! Okay, down. Keep it coming. You’re good.’
Using his trackpad and turntable controls, Leo opened the claw. Its prongs settled around the grooves in the circular stone structure below. He checked the aerial stabilizers and the monitor’s video feed.
‘Okay, little buddy.’ Leo patted the Archimedes sphere embedded in the helm. ‘This is all you.’
He activated the sphere.
The grabber arm began to turn like a corkscrew. It rotated the outer ring of stone, which ground and rumbled but thankfully didn’t shatter. Then the claw detached, fixed itself around the second stone ring and turned it in the opposite direction.
Standing next to him at the monitor, Piper kissed him on the cheek. ‘It’s working. Leo, you’re amazing.’
Leo grinned. He was about to make a comment about his own awesomeness, then he remembered the plan he had worked out with Hazel and Frank – and the fact that he might never see Piper again after tomorrow. The joke sort of died in his throat. ‘Yeah, well … thanks, Beauty Queen.’
Below them, the last stone ring turned and settled with a deep pneumatic hiss. The entire fifty-foot pedestal telescoped downward into a spiral staircase.