stand clear of the descending bubble, in three, two…'
James glanced up as a gust of air pounded through the space from above, rippling through the commuters' robes and Merlin's long beard. The round, crystal skylight in the center of the ceiling bulged downwards at the force of the gust. The window elongated, trembled, and popped free, forming a monstrous, rainbow-streaked bubble. The bubble dropped precipitously onto one of the long boats, enveloping it, and then sank away into the depths, taking the boat with it. Amazingly, none of the gathered throng seemed alarmed or even to have noticed what had happened.
'I did some reading on this last night,' Lucy said faintly, looking at the domed ceiling. 'In the Atlantean Library. It's sort of a wonder of the world, you know, second only to the great library at Alexandria.'
'Fascinating,' Albus said. 'You know how interested we all are in libraries, but maybe you can get to the bit about the giant doom bubbles swallowing up ships.'
'Well, I'm making some guesses here,' Lucy replied, following as the troop threaded onto a narrow gangplank, 'but the entire continent of Atlantis has volcanic origins. Unfortunately, the volcanoes that created the continent are what ended up destroying it, breaking it up and stripping away all of its foundations. The Atlanteans harnessed the power of the volcanoes, though, and used their vents to power their industry. I would guess that that's what's behind all of this.'
'What do you mean?' Ralph asked, stepping, somewhat reluctantly, onto the deck of one of the narrow boats, which was about the size of the Knight Bus. The boat captain stood in his red tunic and funny hat, scowling at a series of copper gauges installed on a post near the rudder lever.
'I suspect that those big gusts of air are volcanic exhaust,' Lucy frowned thoughtfully. 'And this pool is probably part of the subterranean vent system.'
'No fears, everyone,' Percy said cheerfully, leading Molly and Audrey to one of the benches near the front of the boat. 'But do strap in and hold tight. I've heard this can be quite a ride.'
'The famed Aquapolis Transit Authority,' Harry said, seating himself between Ginny and Lily. 'The scheduling and dispatching model for the entire wizarding world. Percy's right. Strap in and hold onto your bags, everyone.'
Albus glanced at James with an expression of mingled excitement and trepidation.
'So what's it do?' Ralph asked. 'I haven't had the greatest luck with wizarding transportation systems.'
'There's no way to explain it properly before we leave, Ralph,' Petra answered, buckling the copper clasps of her safety belt and helping Izzy with hers. 'One word of advice before we go though.'
Ralph looked at her a bit helplessly. 'What's that?'
'Swallow your gum.'
Another chime rang through the crowded space. James looked around at the bobbing boats, the floating gangplanks, the throngs of busy Atlantean commuters on the terraces above, and grinned with nervous anticipation. Once again, the female voice rang out.
'All commuters destined for the surface and launch points beyond, your skiff is departing now. Please stand clear of the descending bubble, in three, two…'
As one, the travelers looked up. High above, the bubble ceiling bulged downwards, pushed by a blast of warm, vaguely sulfur-scented air. The bubble expanded, broke away, and dropped onto them. James couldn't help ducking and covering his head. A sudden burst of pressure popped his ears and he felt the boat drop away beneath him as the bubble distorted the surface of the water, turning it concave. And then, with a dull, gurgling roar, the bubble dropped into darkness, taking the boat, and all those aboard, down with it.
Green darkness surrounded the boat. James drew a breath to comment on it, but a sudden explosion of velocity forced the air right back out of his lungs. Inertia pushed him back into his seat like a giant, soft hand. The ship's captain clung to the rudder lever as the bubble carried the craft forward, sucked into a tube of rough, dark rock. The noise of the journey was a dull thunder, pushing on James' ears like cotton batting. He turned to look at Albus and then Ralph, both of whom were staring with wide eyes, Albus in delight, Ralph with green-faced terror. In front of them, Petra had her arm around Izzy, who was looking around with undisguised wonder. To James' complete amazement, the rest of the travelers (his family and Merlin excluded) were completely ignoring the dark view that rushed around them. Most of the Atlanteans had their noses buried in books and small scrolls or were busily tapping notes onto tablets with glimmering, enchanted chisels. One of them, a man with a long grey beard and red leather sandals on his feet, was sprawled on a corner bench, dozing.
In the darkness far ahead of the boat, a glimmer of purple light appeared. It grew with shocking speed, and James craned in his seat to watch it flash past. The purple glow formed very angular words, which shone brightly in the darkness: '
While turned around in his seat, James saw that the job of the captain was not so much to steer the ship as it was to angle it up the sides of the bubble as it shot around curves, thereby conserving the monumental centrifugal forces and keeping the passengers more or less in their seats. In the darkness it was hard to tell, but James had a sense that much of the time, the boat was sideways, or even upside-down, carried full circle around the circumference of the bubble as it rocketed through the curving vent tunnels. More copper-valved exits flashed past, listing off districts of the city.
There was one harrowing moment when another larger bubble ship appeared in the tunnel before them, moving much more slowly, and James was certain that their smaller boat was going to ram into it. The captain twitched the rudder lever deftly, however, and James felt their boat revolve swiftly up, changing their inertia just enough to push the bubble over the larger boat. For one bizarre moment, James and his companions found themselves upside-down, looking
Finally, a much larger valve appeared in the dark distance, enclosing what appeared to be the end of the tunnel. The glowing purple letters over it read: 'SURFAC
'Be prepared for sudden stops,' the captain bellowed in a clipped monotone. James gripped his seat and gritted his teeth.
The bubble ship shot through the valve and into blinding golden light. Instantly, the ship lost almost all of its momentum and dragged to a near halt. James felt the safety belt pinch his middle as inertia threw him forward. A second later, the force broke and he flopped backwards against the bench, his hair flying. He looked around dazedly.
Petra ran a hand through her hair and smiled down at Izzy, who clapped her hands in delight.
'That was excellent!' Albus cried.
Lucy smoothed her blouse and looked aside. 'How are you doing, Ralph?'
Ralph blinked. 'You know,' he mused, 'I think I was too startled to realize I should be sick.'
James craned to look behind him again. The bubble ship was still underwater, moving up and away from the submerged city. Even now, the sprawling Aquapolis was growing faint in the shimmering distance. James understood now what the mysterious shapes were that he had seen earlier that morning, the mirrored bubbles that had moved ponderously back and forth between the city and the ocean's surface. He and his fellow travelers were inside one of them now.
'I think I could live here,' he murmured, turning back around in his seat.
'Ugh, not me,' his cousin Molly replied from a few benches away, seated between Aunt Audrey and Uncle Percy. 'Too cold and dark.'
'That's what makes it so cool,' Albus argued. 'It reminds me of the Slytherin dungeons under the
